KR100477956B1 - System and method for filtering message edited with special letters - Google Patents

Abstract

The present invention relates to a method and system for filtering a message edited using a special character, the method according to the present invention, generating a table for special characters that can be used as a general character-the table as a general character Available special characters and a hexadecimal code corresponding to each special character are stored— (a); (B) comparing the hexa codes of the message text transmitted by the user with the hexa codes of the table; As a result of the comparison in step (b), if at least one of the hexadecimal codes of the message text matches the hexadecimal code of the table, whether the special character corresponding to the hexadecimal code is a hexadecimal code that can be used as a consonant of a normal character (C) determining whether the hexa code can be used as a vowel; (D) determining whether a meaningful character is formed through a special character by using previous or next hexa code information of the hexa code of the message text that matches the hexa code in the table; And (e) performing filtering of a corresponding message according to the determination result of step (d). According to the present invention, even if a message is created through a special character in order to avoid filtering by string matching, the message can be effectively filtered.

Description

System and Method for Filtering Message Edited with Special Letters}

The present invention relates to a method for filtering a message transmitted over a network, and more particularly, to a method for filtering a message edited using a special character.

As the Internet has evolved, sending and receiving messages between users over the Internet has become quite convenient. Users can send and receive messages in various forms through messages, chats, messengers, and mail, and it is essential to send and receive messages in communities and online games.

Such a message delivery service is a service provided for exchanging opinions between users, but as the number of abuses is increased, the message or the service provider is suffering from the message.

For example, such messages may include pornographic messages that are delivered to an unspecified number of users, messages that are used to cash game money from users through hacking, and the like.

In the past, such spam messages were generally filtered using a string matching method. For example, when the keyword 'money' is set as a blocking keyword to block exchange of game money due to a message, the message is blocked when the message includes the text 'money'. String matching is an algorithm based on artificial intelligence, and various string matching methods are currently open.

However, in order to circumvent message filtering by string matching, spam messages are often transmitted by using special characters such as full-width symbols.

FIG. 1 is a diagram illustrating an example of a message for avoiding string matching using an em symbol, and as shown in FIG. 1, it may be understood as a blocking keyword 'money' using an em symbol such as '㉤' and '㉡'. Increasingly, there is an increasing number of cases in which a message containing a blocking keyword is transmitted by editing a character that can be filtered out without being filtered by string matching.

The above special characters are recognized as one consonant or vowel, but they occupy 2 bytes of space like the completed character. When meaningful characters are formed through special characters, they occupy 3 or 4 bytes of space. There is a problem that can not be detected by a string matching consisting of, and since the characters can be formed in various combinations, there was a problem that it is impossible to filter realistically by conventional string matching.

In order to solve the problems of the prior art as described above, the present invention proposes a method that can filter a message edited using a special character without using a string matching method.

Another object of the present invention is to propose a method for filtering a message edited by a special character using a hexa code of the message text.

In order to achieve the object as described above, according to a preferred embodiment of the present invention, generating a table for the special characters that can be used as a normal character-the special characters and each special that can be used as a general character in the table A hexa code corresponding to a letter is stored— (a); (B) comparing the hexa codes of the message text transmitted by the user with the hexa codes of the table; As a result of the comparison in step (b), if at least one of the hexadecimal codes of the message text matches the hexadecimal code of the table, whether the special character corresponding to the hexadecimal code is a hexadecimal code that can be used as a consonant of a normal character (C) determining whether the hexa code can be used as a vowel; (D) determining whether a meaningful character is formed through a special character by using previous or next hexa code information of the hexa code of the message text that matches the hexa code in the table; And filtering (e) the message according to the determination result of the step (d).

According to another embodiment of the present invention, a table for storing special characters that can be used as general characters and hexa code information corresponding to each special character; A character matching module for comparing the hexa codes of the message text transmitted by the user with the hexa codes of the special characters of the table; Using the comparison result of the character matching module, it is determined whether at least one hexadecimal code of the message text matches the hexadecimal code of the table, and a special character corresponding to the matching hexadecimal code can be used as a general consonant. Special character detection module for determining whether the character or a special character that can be used as a vowel; When the special character detection module detects a special character, the filtering determination module determines whether a meaningful character is formed through the special character by examining the previous hexa code or the next hexa code of the message text hexa code corresponding to the special character. ; And when a meaningful character is formed through a special character, there is provided a filtering system for a message edited using a special character comprising a filtering module for filtering the message.

According to another embodiment of the present invention, generating a table for special characters that can be used as general characters, in which the special characters that can be used as general characters, hex codes corresponding to each special character, and each special character General character information associated with the stored- (a); (B) comparing the hexa codes of the message text transmitted by the user with the hexa codes of the table; As a result of the comparison of step (b), if the hexadecimal code of the message text matches any one of the hexadecimal codes of the table, the special character corresponding to the hexadecimal code is replaced with a general character stored in association with the table. Step (c); Repeating steps (b) and (c) for all hexa codes in the message text; (E) performing string matching using a preset blocking keyword for the substituted message; And (f) filtering the corresponding message when there is a string corresponding to the blocking keyword as a result of string matching. The filtering method of the message edited using the special character is provided.

Hereinafter, an embodiment of a message filtering method and system edited using special characters according to the present invention will be described in detail with reference to the accompanying drawings.

2 is a flowchart illustrating a message filtering method including special characters according to an exemplary embodiment of the present invention.

Referring to FIG. 2, first, a table of special character consonants and vowels that can be recognized as general characters is generated (step 200). The special character is typically a full-width symbol, and may include all symbols that can be inserted using a text editor in addition to the general Hangul characters.

For example, a full-width symbol '㉡' may be used as a Korean consonant 'ㄴ', and a full-width symbol '┧' may be used as a Korean vowel 'ㅓ'. The special character table is a table of special characters that can be used as general vowels and general consonants. The special characters included in the table can be changed in various ways according to the administrator's settings. In addition, the special character table includes a hexa code field, and the hexa code corresponding to each special character is recorded together. Detailed examples of the special character table will be described later.

When the user sends the message, hex code data of the message text is extracted (step 200). Here, the message may include all of a message, an instant message, a mail message, and the like, and a sentence posted on a bulletin board may be included in the message.

In the conventional filtering method, since the text of the message is compared with a preset blocking keyword, the hexadecimal code data of the message text is not used for message filtering. However, the present invention uses a hexadecimal code of the message text to prevent the creation and transmission of a string having a meaning corresponding to the blocking keyword by using a special character.

After extracting the hexa code of the message text, it is determined whether at least one or more of the hexa codes of the message text match the hexa codes in the preset special character table (step 204). This is to determine whether the message contains special characters that can be used as consonants or vowels.

If at least one of the hexadecimal codes of the message text matches the hexadecimal code of the preset table, it is determined whether a special character is formed using a special character (step 206). Even if the message contains characters corresponding to the consonants and vowels of the special characters on the table, they may have been used regardless of the keyword you want to block. Therefore, if a message is blocked only by using a special character included in the table, a well-being victim may occur. Therefore, in the present invention, it is again checked whether a meaningful character is made through a special character.

According to a preferred embodiment of the present invention, it is determined that the following three cases are cases in which meaningful characters are formed using special characters. However, it will be apparent to those skilled in the art that the case of forming meaningful characters through special characters is not limited to the following three cases, and more cases may be added according to the administrator's setting.

The first case is when a preset special character consonant and a preset special character set are used together. For example, if this '㉠' is set as a special character consonant and '┤' is set as a special character collection, create a string of '특수' with only the special character This is the case when forming a string to make it visible.

The second case uses special characters as consonants and regular letters as vowels. For example, a case such as '㉠ ㅓ' belongs to this. This is a case where a string is formed using '보이' instead of 'ㄱ' so that it looks like the same character as Hangul 'Geo'.

The third case is the use of ordinary consonants as consonants and special characters as vowels. For example, a case such as 'ㄱ ┤' belongs to this. This is the case when the character string is formed to look like the 'Geo' of Hangul using the special character '┤' instead of the vowel 'ㅓ'.

According to the present invention, if a message text has a hexadecimal code on a preset table, the meaning is determined by special characters by determining whether the message text belongs to the above three cases by examining the next or previous hexadecimal code of the corresponding hexadecimal code. Determine if a character is formed.

As a result of the determination, if belonging to the three cases described above, the message data is filtered (step 208).

3A is a diagram illustrating an example of a system in which a message filtering method according to the present invention is used.

Referring to FIG. 3A, a system using a message filtering method according to the present invention includes a message queue including a listener 312, a queue 314, a reader 316, and a business logic module 318. Server 302 and message delivery server 304 and message database 306.

The system of FIG. 3A illustrates a system for delivering a message (which performs the same function but may be used with another name), and the present invention blocks the transfer of a meaningful message by using special characters in the message. Can be used. FIG. 3A illustrates an example of a message delivery system, and it will be apparent to those skilled in the art that the method according to the present invention can be applied to a message transmission system different from that of FIG. 3A.

In FIG. 3A, when a user sends a message to another user through a user client, the sent message is sent to a listener 312 of the message queue server 302, and the listener stores the sent message in the queue 314. do.

The reader 316 retrieves the message stored in the queue in a FIFO manner and provides it to the business logic module 318.

The business logic module 318 is logic that performs additional functions required in connection with message processing. The filtering of prohibited messages is also performed by the business logic module 318. The message filtering module 320 included in the business logic module 318 determines whether or not a meaningful character is included in the message using a special character through the process of FIG. 2.

If the message filtering module 320 determines that the message does not need to be filtered, the message is sent to the message delivery server 304 and stored in the message database 306. When the user corresponding to the message recipient later requests the message, the message delivery server retrieves the message data from the message database and delivers the message.

As a result of the determination by the message filtering module 320, if the message needs to be filtered, the message is not transmitted to the message delivery server 304.

3B illustrates another example of a system in which a message filtering method according to the present invention is used.

Referring to FIG. 3B, a system using a message filtering method according to the present invention includes a message queue server 321 including a listener 330, a queue 332, a reader 334, and a business logic module 336. It may include a delivery server 324 and a gateway monitoring server 326.

The system of FIG. 3B illustrates a system for transmitting an instant message such as a messenger, and the filtering method according to the present invention may be applied to an instant message transmitted through a messenger.

In FIG. 3B, when a user sends an instant message to another user via messenger, the sent instant message is sent to the listener 330 of the message queue server 321, and the listener stores the sent message in the queue 332. do.

The reader 334 retrieves the queued instant messages in a FIFO fashion and provides them to the business logic module 336.

The message filtering module 338 included in the business logic module 336 determines whether the instant message includes meaningful characters using the special characters through the process of FIG. 2.

If the message filtering module 338 determines that the message does not need to be filtered, the instant message is transmitted to the message delivery server 324, and the message delivery server 324 transmits the instant message to the user. The gateway monitoring server 326 manages user login through a messenger and status information of users accessing the messenger. Although not shown in FIG. 3B, a database may be connected to the message delivery server to store messages sent and received between users.

If the message filtering module 336 determines that the message needs to be filtered, the message is not transmitted to the message delivery server 304. Alternatively, the filtered message may not be sent to the user but only stored in the database.

3C illustrates another example of a system in which a message filtering method according to the present invention is used.

FIG. 3C illustrates a case in which a meaningful character is created by using special characters in a mail message. Referring to FIG. 3C, the MTA 340, the MTA 342, the MDA 344, and the message filtering module 346. , Mailbox 348 and MRA 350.

The mail user agent (MUA) 340 is a client program used when a user sends and receives an e-mail. In the case of web mail which checks mail from a remote mail system through a protocol such as POP or IMAP, an Internet browser is generally used as a MUA. Other MUAs may include mail browser programs such as Microsoft's Outlook Express and Netscape's Netscape Mail.

The Mail Transfer Agent (MTA) 342 receives e-mail through the Simple Mail Transfer Protocol (SMTP) communication protocol. That is, the MTA 342 calls the Mail Delivery Agent (MDA) 120 to send an e-mail received from another MTA or MUA to another MTA or to instruct a user's mailbox 348 to deliver the e-mail.

The MDA 344 performs a function of delivering an e-mail received by the MTA 342 to an actual user, and a case of delivering the message internally and externally occurs. In case of external transmission, each MDA exists according to a channel. When delivered internally, the received e-mail is stored in each user's mailbox.

The mail box 348 is a database for storing e-mail. The mail box 348 is a method of continuously adding an e-mail to one file (MBOX) or a method of storing each e-mail as a separate file in one directory. Currently, the MBOX method is the most widely used.

Mail Retrieval Agent (MRA) 350 is a program that allows a user to access to check e-mail from the outside, and includes POP3 DEAMON and IMAP4 DEAMON.

The message filtering module 346 may be provided at the front end of the mailbox 348, and determines whether the mail message includes meaningful characters using special characters through the process of FIG. 2. The message filtering module 346 may filter the mail message by scanning only the subject field of the mail, or may filter the mail message by scanning the body of the mail.

Although FIG. 3C illustrates a case in which the message filtering module is separately provided, it will be apparent to those skilled in the art that the message filtering module may be included in the MDA 344.

If the message filtering module 346 determines that the message does not need to be filtered, the mail message is stored in the mailbox 348.

As a result of the determination by the message filtering module 346, when the message needs to be filtered, the mail message may not be stored in the mailbox. Alternatively, the mail message may be stored in a spam mailbox of a mailbox.

3d illustrates another example of a system in which a message filtering method according to the present invention is used.

FIG. 3D is a system for filtering posting of posts that form meaningful characters by using special characters on the bulletin board. Referring to FIG. 3D, a web server 360 and a bulletin board database 362 may be included.

The user edits a post through a web page provided by the web server 360 and transmits the edited post information to the web server 360.

The text filtering module 364 included in the web server 360 performs a process as illustrated in FIG. 2 with respect to post text posted by a user.

If the message filtering module determines that the post does not need to be filtered, the post edited by the user is stored in the bulletin board database 362. However, if the post needs to be filtered, the web server refuses to register the post.

Although FIG. 3A to FIG. 3D have described the system to which the message filtering method according to the present invention is applied, the system to which the method of the present invention is applied is not limited to FIGS. 3A to 3D, and the service system of FIGS. 3A to 3D. In addition, it will be apparent to those skilled in the art that the present invention can be applied to a service system that delivers a text message to a counterpart. For example, the present invention may be applied to a chat message system, particularly a chat message system that delivers a chat message transmitted and received while playing a game.

4 is a block diagram illustrating a configuration of a message filtering module according to an exemplary embodiment of the present invention.

As shown in FIG. 4, the message filtering module according to an exemplary embodiment of the present invention may include a character matching module 400, a special character table 402, a special character detection module 404, a filtering determination module 406, The filtering module 408 may include a general character table 410.

The special character table 402 stores special characters that can be utilized as consonants and special characters that can be utilized as vowels, and each of the hexadecimal codes is also stored.

Table 1 below shows an example of a special character table that stores special characters that can be used as consonants.

Consonant HEX Mode Consonant HEX Mode Consonant HEX Mode Consonant HEX Mode Consonant HEX Mode ㉯ A8 C0 ㉠ A8 B1 ㉰ A8 C1 ㉡ A8 B2 ㉱ A8 C2 ㉢ A8 B3 ㉲ A8 C3 ㉣ A8 B4 ㉳ A8 C4 ㉤ A8 B5 ㉴ A8 C5 ㉥ A8 B6 ㉵ A8 C6 ㉦ A8 B7 ㉶ A8 C7 ㉧ A8 B8 ㉷ A8 C8 ㉨ A8 B9 ㉸ A8 C9 ㉩ A8 BA ㉹ A8 CA ㉪ A8 BB ㉺ A8 CB ㉫ A8 BC ㉻ A8 CC ㉬ A8 BD Ⓐ A8 CD ㉭ A8 BE □ A1 E0 ㉮ A8 BF ■ A1 E1

As shown in Table 1 above, each special character that can be used as a consonant and a corresponding hexadecimal code are stored in a table. Table 1 above is an example of special characters that can be used as consonants, and more special characters may be utilized as consonants, and it will be apparent to those skilled in the art that these special characters may be added to the table.

Table 2 below shows an example of a special character table that stores special characters that can be used as vowels.

collection HEX Mode collection HEX Mode collection HEX Mode collection HEX Mode collection HEX Mode ┛ A6 B0 ╂ A6 C0 ┪ A6 D0 ╆ A6 E0 ─ A6 A1 ┗ A6 B1 ┒ A6 C1 ┭ A6 D1 ╇ A6 E1 │ A6 A2 ┣ A6 B2 ┑ A6 C2 ┮ A6 D2 ╈ A6 E2 ┌ A6 A3 ┳ A6 B3 ┚ A6 C3 ┱ A6 D3 ╉ A6 E3 ┐ A6 A4 ┫ A6 B4 ┙ A6 C4 ┲ A6 D4 ╊ A6 E4 ┘ A6 A5 ┻ A6 B5 ┖ A6 C5 ┵ A6 D5 └ A6 A6 ╋ A6 B6 ┕ A6 C6 ┶ A6 D6 ├ A6 A7 ┠ A6 B7 ┎ A6 C7 ┹ A6 D7 ┬ A6 A8 ┯ A6 B8 ┍ A6 C8 ┺ A6 D8 ┤ A6 A9 ┨ A6 B9 ┞ A6 C9 ┽ A6 D9 ┴ A6 AA ┷ A6 BA ┟ A6 CA ┾ A6 DA ┼ A6 AB ┿ A6 BB ┡ A6 CB ╀ A6 DB ━ A6 AC ┝ A6 BC ┢ A6 CC ╁ A6 DC ┃ A6 AD ┰ A6 BD ┦ A6 CD ╄ A6 DD ┏ A6 AE ┥ A6 BE ┧ A6 CE ╄ A6 DE ┓ A6 AF ┸ A6 BF ┩ A6 CF ╅ A6 DF

The character matching module 400 compares the hexa code of the text included in the message with the hexa code of the special character included in the special character table 402. The character matching module 402 simply performs a matching operation on the hexa code of the message and the hexa code on the special character table, and does not perform an AI related process such as string matching.

Hex codes of special character tables usually have certain rules for each group. For Table 1, the special characters 문자 through ㉭ correspond to hexa code A8B1 through A8BE. Therefore, rather than comparing the hexadecimal code of the message text with the hexadecimal code on the table in a one-to-one correspondence, specify a range for the data on the table and determine the message hex for that range, such as determining whether it is within the range of A8B1 to A8BE. Character matching may be processed more quickly by a method of determining whether code is included.

The special character detection module 404 determines whether the character matching result message has a hexadecimal code corresponding to the special character in the special character table, and if the message includes the special character, the special character is used as a consonant. This function determines whether or not it is a special character or a special character used as a vowel.

When the special character detection module 404 detects that the message includes special characters that can be used as consonants or vowels, the filtering determination module 406 determines whether the special characters have formed meaningful characters. If it is determined that the meaningful character is formed through the special character, the filtering determination module 406 determines that it is necessary to filter the message. Alternatively, the filtering determination module 406 may count the cases that make meaningful characters through special characters and perform filtering when a case above a preset threshold occurs.

When the special character detected in the message is a special character used as a consonant, the filtering determination module 406 determines whether a character following the detected special character in the message corresponds to a general vowel or a special character collection. At this time, once again, the character matching module 400 determines whether the next character corresponds to the general vowel or the special character vowel, and the hexa code information for the general character is stored in the general character table 410. Of course, all the hexadecimal information for regular characters can be stored in the special character table.

When the character following the detected special character corresponds to the general vowel or the special character collection, the filtering determination module 406 determines that the meaningful character is formed through the special character.

If the special character detected in the message is a special character used as a vowel, the filtering determination module 406 determines whether a character before the special character detected in the message corresponds to a general consonant or a special character consonant.

When the character before the detected special character corresponds to a general consonant or a special character consonant, the filtering determination module 406 determines that the meaningful character is formed through the special character.

When the filtering determination module 406 determines that the message needs to be filtered, the filtering module 408 performs a function of filtering the corresponding message. For example, if the message is a message message, the filtering module 408 blocks storing the message in the database. In addition, when the message is a mail message, the filtering module 408 does not store the mail in a mailbox or stores the mail in a spam folder of the mailbox.

5A is a flowchart illustrating a process in the case where a special character consonant is included in a message according to an exemplary embodiment of the present invention.

Referring to FIG. 5A, first, a process of comparing the i-th hex code of a message text with a special consonant on a table is performed (step 500). As described above, it is also possible to predefine a range of special consonant hexacodes on the table and determine whether the i-th hexacode is included in the specified range, and if the range of special consonant hexacodes on the table cannot be specified, the respective table data. 1: 1 matching may also be performed. Of course, both methods may be compared in parallel.

As a result of the comparison, when the i th hexa code is included in the special consonant (step 502), it is determined whether the (i + 1) th hexa code of the message corresponds to the general vowel or the special vowel (step 504). The comparison method will be the same as for step 500.

If the (i + 1) th hexadecimal code of the message corresponds to the general vowel or the special vowel, the message is determined to have formed a meaningful character through the special character, and the process of filtering the message is performed (step 508). . Of course, as described above, it may be possible to count the number of times that a meaningful character is formed through a special character and to filter the message when the preset threshold is exceeded.

If the i th hexa code does not correspond to the special consonant, it is determined whether the i th hexa code is the end of the hexa code, and if not, the steps 500 to 508 are repeated for the (i + 1) th hexa code.

5B is a flowchart illustrating a process in the case where a special character consonant is included in a message according to another embodiment of the present invention.

FIG. 5B differs from FIG. 5A only in the process of comparing the hexadecimal code of the message text and the special consonant in the table, and the rest of the process is the same. In FIG. 5A, the hexadecimal code of the special text table is compared with the hexadecimal codes of the special text table based on the hexadecimal code of the message text. In FIG. Since the hexadecimal codes of the message are generally nonregular and cannot be scoped, the method of FIG. 5A would be more desirable if the hexadecimal codes of the special character table are regular.

6A is a flowchart illustrating a processing process when a special character collection is included in a message according to an exemplary embodiment of the present invention.

Referring to FIG. 6A, first, a process of comparing a special collection on a table with an ith (which is initially set to 1) of a message text is performed (step 600). As with the comparison of special consonants, you can also predefine a range of special collection hexacodes on the table and determine if the specified range contains the i-th hexacode; if you cannot specify a range of special collection hexacodes on the table. One-to-one matching may be performed on each table data, or the above methods may be compared in parallel.

As a result of the comparison, when the i th hexa code is included in the special vowel (step 602), it is determined whether the (i-1) th hexa code of the message corresponds to the general consonant or the special consonant (step 604). The comparison method will be the same as in the case of step 600.

If the (i-1) th hexadecimal code of the message corresponds to a general consonant or a special consonant, the message is determined to have formed a meaningful character through a special character, and a process of filtering the message is performed (step 608). . As described above, the number of times a meaningful character is formed through the special character may be counted and the message may be filtered when the preset threshold is exceeded.

If the i th hexacode does not correspond to the special vowel, it is determined whether the i th hexa code is the end of the hexa code, and if not, the steps 600 to 608 are repeated for the (i + 1) th hexa code.

FIG. 6B is a flowchart illustrating a process in the case where a special character collection is included in a message according to another embodiment of the present invention. Only a method of comparing a hexa code corresponding to a special collection and a hexa code corresponding to a special collection is different. The rest of the process is the same. In other words, FIG. 6B compares whether or not the hexadecimal codes of the message text are the same with respect to the special vowel hexa codes on the table as shown in FIG. 5B.

7 is a flowchart illustrating the overall flow of the filtering determination method according to an embodiment of the present invention.

7 is a method incorporating the method of FIG. 5A and the method of FIG. 6A, and the filtering determination method may be performed by the process of FIG. 7.

Referring to FIG. 7, the i (first set to 1) hex code of the message is compared with the hexa codes in the special character table (step 700).

As a result of the comparison, it is determined whether the i th hexa code matches one of the hexa codes in the special armless table (step 702).

If the i hexa code of the message matches one of the hexa codes in the special character table, it is determined whether the matching hexa code corresponds to a special character consonant or a vowel (step 704).

If the hexadecimal code corresponds to a special character consonant, it is determined whether the (i + 1) th hexadecimal code of the message corresponds to a general vowel or a special vowel (step 706).

When the (i + 1) th hexadecimal code corresponds to a general vowel or a special character set, it is determined that the meaningful character is formed using the special character, and the message is filtered (step 710).

In step 704, if the matching hexa code corresponds to a special character collection, it is determined whether the (i-1) th hexa code of the message corresponds to a general consonant or a special character consonant (step 708).

If the (i-1) th hexa code corresponds to a general consonant or a special character consonant, it is determined that the meaningful character is formed using the special character, and the message is filtered (step 710).

If it is determined that the i hexa code does not match one of the hexa codes in the special character table or does not form a meaningful character using a special character, it is determined whether i is the end of the hexa code (step 712). If not, repeat steps 700 to 710 for the (i + 1) th hexa code.

8 is a flowchart illustrating the overall flow of a message filtering method according to another embodiment of the present invention.

In the above-described embodiment, a method of performing filtering when a meaningful character is formed using a special character (sometimes, filtering by setting a number of meaningful characters) has been described. In the case of performing the filtering according to the above-described embodiment, since the filtering is performed by forming a meaningful character through the special character, the filtering may be performed even when a character different from the blocking keyword is formed through the special character. FIG. 8 proposes a filtering method for preventing a case in which a well-being victim can be caused by the filtering.

Referring to FIG. 8, first, a special character consonant and a vowel table are generated (step 800), and a general consonant and a general vowel corresponding to each special character consonant and a vowel are set on the table (step 802).

By creating one more field in the table, such as Table 1 and Table 2, it forms a table that contains more information on what consonants and vowels are used when each special character is used as a normal character.

After the table is formed, when the user requests to send a message, the hexadecimal code of the message text is compared with the hexadecimal codes included in the table (step 804). A method of comparing the hexa code of the message text and the hexa code of the table has been described in detail with reference to FIGS. 5A and 5B.

If the hexadecimal code of the message matches one of the hexadecimal codes included in the table, the special character corresponding to the hexadecimal code is replaced with the normal character (step 808). For example, if there is a hexadecimal code corresponding to '㉠' in the message, the special character '㉠' in the message is replaced with the general consonant 'ㄱ'.

If steps 804 to 808 are performed for one hexa code of the message, it is determined whether the hexa code is the last hexa code of the message (step 810), and if it is not the last hexa code, step for the next hexa code of the message. 804 through 808 are performed.

If steps 804 through 808 are performed for all hexa codes in the message, all special characters in the message are replaced with ordinary characters. String matching is performed on the blocked keyword with respect to the replaced message (step 812). For example, when the blocking keyword is 'money', string matching for 'money' is performed on the substituted message.

As a result of the string matching, if the same string as the blocking keyword exists (step 814), the message is filtered (step 816).

By using the method as shown in FIG. 8, even if a meaningful character is formed with a special character, only the case corresponding to the blocking keyword may be filtered to minimize the victim of good faith by the filtering.

As described above, according to the present invention, even if a message is created through special characters in order to avoid filtering by string matching, the message can be effectively filtered.

In addition, according to the present invention, it is possible to easily filter a message using a special character by performing the filtering using the hexa code of the message text.

1 illustrates an example of a message that avoids string matching using an em symbol.

2 is an overall flowchart of a message filtering method including special characters according to an exemplary embodiment of the present invention.

3A shows an example of a system in which the message filtering method according to the present invention is used.

3B illustrates another example of a system in which a message filtering method according to the present invention is used.

FIG. 3C illustrates another example of a system in which a message filtering method according to the present invention is used. FIG.

FIG. 3D illustrates another example of a system in which a message filtering method according to the present invention is used. FIG.

Figure 4 is a block diagram showing the configuration of a message filtering module according to an embodiment of the present invention.

5A is a flowchart illustrating a process in the case where a special character consonant is included in a message according to an exemplary embodiment of the present invention.

5B is a flowchart illustrating a processing process when a special character consonant is included in a message according to another embodiment of the present invention.

6A is a flowchart illustrating a process in the case where a special character collection is included in a message according to an exemplary embodiment of the present invention.

6B is a flowchart illustrating a processing process when a special character collection is included in a message according to another embodiment of the present invention.

7 is a flow chart showing the overall flow of the filtering determination method according to an embodiment of the present invention.

8 is a flow chart showing the overall flow of a message filtering method according to another embodiment of the present invention.

Claims (14)

A method of filtering edited messages using special characters. Generating a table of special characters usable as general characters, wherein the table stores special characters usable as general characters and a hexa code corresponding to each special character (a); (B) comparing the hexa codes of the message text transmitted by the user with the hexa codes of the table; As a result of the comparison in step (b), if at least one of the hexadecimal codes of the message text matches the hexadecimal code of the table, whether the special character corresponding to the hexadecimal code is a hexadecimal code that can be used as a consonant of a normal character (C) determining whether the hexa code can be used as a vowel; (D) determining whether a meaningful character is formed through a special character by using previous or next hexa code information of the hexa code of the message text that matches the hexa code in the table; And And filtering (e) the corresponding message according to the determination result of the step (d). The method of claim 1, The message is filtered by using a special character, characterized in that any one of the message, instant message, mail message, the message to register on the bulletin board. The method of claim 1, And filtering the message edited using the special character, wherein the special character includes an em symbol. The method of claim 1, The method of filtering a message edited using a special character, characterized in that the table is stored special characters that can be used as consonants of the general character and special characters that can be used as a vowel. The method of claim 4, wherein Step (d) is, If a special character corresponding to the hexadecimal code of the message text that matches the hexadecimal code of the table can be used as a consonant consonant, then the next hexadecimal code of that hexadecimal code can be used as the hexadecimal code or common character set corresponding to the normal character set. Determining whether or not belonging to at least one of the hexa codes corresponding to the special character present; If the next hexadecimal code of the corresponding hexadecimal code is included in at least one of the hexadecimal equivalents of the normal character set or the special hexadecimal code corresponding to the special character that can be used as the normal character set, it is determined that the special character is used to form a meaningful character. Making; If a special character corresponding to the hexadecimal code of the message text that matches the hexadecimal code of the table can be used as the common character set, the previous hexadecimal code of that hexadecimal code can be used as the hexadecimal code or common character consonant corresponding to the normal character consonant. Determining whether or not belonging to at least one of the hexa codes corresponding to the special character present; And If the previous hexadecimal code of the hexadecimal code is a hexadecimal equivalent of a normal consonant or belongs to at least one of the hexadecimal equivalents of a special character that can be used as a consonant consonant, the special character is used to form a meaningful character. And filtering the message edited using the special character. The method of claim 1, Step (e), If a meaningful character is formed by using a special character more than a predetermined number of times in the message, the message is filtered using the special character, characterized in that for filtering the message. The method of claim 1, If the message is a message or an instant message, the filtering is a method of filtering a message edited using a special character, characterized in that the message is blocked from being transmitted to a specified recipient. The method of claim 1, If the message is a mail message, Step (b) is performed on the subject of the mail message or the body of the mail message. The filtering of the step (e) is a method of filtering a message edited using a special character, characterized in that the mail message is not stored in a mailbox or the mail message is stored in a spam folder of the mailbox. A system that filters messages edited using special characters. A table for storing special characters that can be used as general characters and hexa code information corresponding to each special character; A character matching module for comparing the hexa codes of the message text transmitted by the user with the hexa codes of the special characters of the table; Using the comparison result of the character matching module, it is determined whether at least one hexadecimal code of the message text matches the hexadecimal code of the table, and a special character corresponding to the matching hexadecimal code can be used as a general consonant. Special character detection module for determining whether the character or a special character that can be used as a vowel; When the special character detection module detects a special character, the filtering determination module determines whether a meaningful character is formed through the special character by examining the previous hexa code or the next hexa code of the message text hexa code corresponding to the special character. ; And And a filtering module for filtering the corresponding message when a meaningful character is formed through the special character. The method of claim 9, The table further includes a general text consonant and vowel and corresponding hexadecimal codes information, and stores the normal text and the special text to be stored separately. The method of claim 9, The message filtering system edited using a special character, characterized in that any one of a message, an instance message, an e-mail message, a message to register on the bulletin board. The method of claim 9, The filtering determination module, If a special character corresponding to the hexadecimal code of the matching message text can be used as a consonant consonant, then the next hexadecimal code of that hexadecimal code corresponds to the hexadecimal code or to the special character that can be used as a plain character collection. A module for determining whether to belong to at least one of the hexa code; If the next hexadecimal code of the corresponding hexadecimal code is included in at least one of the hexadecimal equivalents of the normal character set or the special hexadecimal code corresponding to the special character that can be used as the normal character set, it is determined that the special character is used to form a meaningful character. A module; If a special character that corresponds to the hexadecimal code of the matching message text can be used as the normal character set, the previous hexadecimal code of that hexadecimal code corresponds to the hexa code or the special character that can be used as a normal character consonant. A module for determining whether to belong to at least one of the hexa code; And If the previous hexadecimal code of the hexadecimal code is a hexadecimal code that corresponds to a normal character consonant or belongs to at least one of the hexadecimal codes that corresponds to a special character that can be used as a normal character consonant, the special character is used to form a meaningful character. System for filtering messages edited using special characters, characterized in that it comprises a module for determining. The filtering module is a filtering system for a message edited using a special character, characterized in that for filtering the message when a meaningful character is formed using a special character more than a predetermined number of times. A method of filtering edited messages using special characters. Creating a table of special characters that can be used as normal characters, wherein the table stores special characters that can be used as normal characters, hexadecimal codes corresponding to each special character, and general character information associated with each special character; a); (B) comparing the hexa codes of the message text transmitted by the user with the hexa codes of the table; As a result of the comparison of step (b), if the hexadecimal code of the message text matches any one of the hexadecimal codes of the table, the special character corresponding to the hexadecimal code is replaced with a general character stored in association with the table. Step (c); Repeating steps (b) and (c) for all hexa codes in the message text; (E) performing string matching using a preset blocking keyword for the substituted message; And And (f) filtering a corresponding message when a string corresponding to the blocking keyword is found as a result of string matching.