KR20020042045A - Method of Transmitting and Receiving An E-mail - Google Patents

Abstract

According to the present invention, when an e-mail sender and a receiver authorize each other to send and receive mail, and the sender sends a mail request to send a message to the receiver, the receiver accesses the sender by using an encryption key given at the time of login and directly retrieves the message. It relates to an email transmission and reception method.

The e-mail sending / receiving system is configured by connecting a server and at least two user clients through a network. A first step in which a client receives encryption information necessary for sending and receiving e-mail from the server, and a second step in which an e-mail to be sent by the sending client is created and stored in its PC system, and a data transmission signal is output to the receiving client. And a third step in which the receiving client accesses the sending client's PC system to authenticate the recipient and take the email.

Description

Method of Transmitting and Receiving An E-mail}

The present invention relates to an e-mail transmission and reception method, and in more detail, an e-mail sender and a receiver authorize each other to send and receive mails, and when the sender sends a message to the receiver, the receiver receives an encryption key given at the time of login. The present invention relates to an e-mail transmission and reception method of directly accessing a sender and directly obtaining a corresponding message.

In general, e-mail is used as a purpose of exchanging information with a desired party through a computer in a home or office, and this is gradually increasing. In conventional e-mail, a sender writes a message to a computer and sends it to a computer called a mail server serving as a post office, and the mail server delivers the message to a recipient computer.

As described above, in the conventional e-mail transmission / reception system, since a message transmitted by a sender is once stored in a mail server, it is difficult to completely secure the message. In other words, knowing the recipient's mail ID and password may hack a message to be delivered to the recipient by unreasonable purpose, and may not deliver the message correctly to the right recipient because the mail server delivers the message to the recipient. There was such a problem. In the case of important documents, the sender may deny transmission after sending a message, or the recipient may deny receiving a message after receiving the message. It is disadvantageous because it has no evidence to refute it.

In addition, because the sender's messages are sent to the recipient's computer in batches via the email server, the sender can send the message to the recipient, knowing only the recipient's email address, and the recipient can receive unwanted spam. There is a problem.

An object of the present invention for solving the problems of the prior art as described above, the sender and the receiver should be authorized to send and receive e-mail to each other and authenticated to send and receive e-mail, even when sending and receiving e-mail sender It is to provide a method of sending and receiving e-mails in which a message is written and stored in its own PC system, and a receiver accesses the sender's PC system and reads the message.

1 is a schematic diagram illustrating a client server system for providing an e-mail transmission / reception service to a client (internet user) using the Internet according to the present invention;

2 is an operation flowchart illustrating a process of logging in to a server system to receive an e-mail transmission and reception service by a user client according to the present invention;

3 is an operation flowchart illustrating an operation of performing an online status check process by a member client;

4 is an operation flowchart illustrating a process in which a transmitting member client authenticates and registers an arbitrary member client with a buddy;

5 is a flowchart illustrating a process of transmitting a message to a buddy client in which a member client logged into the server is online.

※ Explanation of code about main part of drawing ※

110: server system (110) 120: user client group

130: network 141: membership management table

142: buddy information table

In order to achieve the above object, an electronic mail transmission / reception method according to the present invention comprises a server and an at least two user clients connected to each other through an electronic mail transmission / reception system configured to receive a message and a client to which a message is to be transmitted. In the email sending and receiving method between the receiving client,

A first step in which the transmitting client and the receiving client receive encryption information necessary for transmitting and receiving email from the server;

A second step of creating an e-mail to be transmitted by the transmitting client, storing the same in an own PC system, and outputting a data transmission signal to the receiving client; and

And a third step in which the receiving client accesses the PC system of the sending client, authenticates the recipient, and takes the e-mail.

In addition, in an e-mail transmitting and receiving system configured by connecting a server and at least two user clients through a network, an e-mail transmitting method of a transmitting client that wants to transmit a message to a receiving client includes:

A first step of performing an e-mail transmission and reception authentication process with the receiving client;

A second step of receiving encryption information necessary for transmitting and receiving an e-mail with the receiving client from the server,

A third step of creating an e-mail to be transmitted to the receiving client and storing the same in an own PC system and outputting a data transmission signal to the receiving client; and

And if the data request message is received from the receiving client, authenticating the data request message in response thereto and allowing the receiving client to take the email.

In addition, according to the present invention, in an e-mail transmission / reception system in which a server and at least two user clients are connected through a network, a transmission client for transmitting a message to a reception client may be used to execute the e-mail transmission method as described above. A computer readable recording medium having recorded thereon a program is provided.

Further, in an email transmission / reception system configured with a server and at least two user clients connected through a network, an email reception method of a reception client that receives a message from a transmission client may include:

A first step of performing an e-mail transmission and reception authentication process with the sending client;

A second step of receiving encryption information necessary for transmitting and receiving an email with the sending client from the server,

A third step of, upon receiving the data transmission signal from the transmitting client, authenticating the data transmission signal and transmitting a data request message to the transmitting client in response thereto; and

And in response to the data request message being authenticated by the sending client, accessing the PC system of the sending client to retrieve the e-mail.

In addition, according to the present invention, in an e-mail transmission / reception system in which a server and at least two user clients are connected through a network, a computer that records a program for executing an e-mail receiving method of a receiving client receiving a message from a sending client is read. Recordable media are provided.

Hereinafter, an e-mail transmission and reception method according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a schematic diagram illustrating a client server system for providing an e-mail transmission / reception service to a client (Internet user) using the Internet according to the present invention. This client server system includes a server system 110 including a database (DB), a user client group 120 having a PC system connectable to the server system 110 via a network, and a network 130. .

The server system 110 provides an e-mail transmission / reception service to user clients through the network 130. Here, any user client connected to the server system 110 using the network 130 is called a guest, and accesses the server system to receive his / her personal information in order to receive an e-mail transmission / reception service according to the present invention. A user client that has been released and has agreed to a membership agreement is called a 'member'.

The database (DB) connected to the server system 110 is a member management table 141 that largely manages information for each member, and a buddy that any member can send and receive e-mail via the server system according to the present invention. The buddy information table 142 stores and manages information.

In the member management table 141, information such as serial number, member ID, name, gender, age, occupation, social security number, zip code, address, password, e-mail address, membership withdrawal, contact information, and personal mobile phone number are mutually related. Linked and stored. The buddy information table 142 is managed for each member and includes a member ID, a buddy ID for sending a message, a message or mail to be transmitted, an encryption formula and encryption key for receiving a message, a server encryption key, and a buddy encryption key. And the like are mutually linked and stored. Herein, the encryption formula, the server encryption key, the member encryption key, and the buddy encryption key may be given a new value each time they log in, and may be given a different value for each message. The buddy information table is provided to the member client when each member client logs in to the server system, and the member client can know the existence of the message and the sender information when the member client is not online.

2 is an operation flowchart illustrating a process of logging in to a server system in order to receive an e-mail transmission and reception service according to the present invention.

First, the user client connects to the server and transmits a connection message including its IP address and profile (S201). In this case, the connection message transmitted from the user client to the server includes common transmission information, a local IP address, and a password. The common transmission information includes a specialized classification, sent date, received date, member ID, user classification, and free space information.

The server checks the layout of the received connection message (S202). If the check result indicates that there is an error in the received connection message and is not a normal package (S203), the server ignores the received connection message and terminates immediately. However, if the received message is a normal package suitable for the layout (S203), the member information is retrieved from the member management table (S204), and if the legitimate member (S205), the connection response message including the logon success information is transmitted to the corresponding member (S206). ). This normal connection response message includes common transmission information (specialized section, sent date, received date, member ID, user segment, and free space information), local IP address, password, and connection result information. However, if the member is not a legitimate member, the connection response message including the failure code and the logon failure information is transmitted (S207). Here, the received date field of the connection message sent by the user client to the server is sent blank and filled by the server and sent to the member client.

The member client that is normally logged on and is entitled to use the service sends a request for sending a buddy list to the server. This buddy list transmission message includes the common transmission information (specialization, sent date, received date, member ID, user identification). , And free space information) and the local IP address (S208). Then, the server sends a buddy list response message to each member client for each buddy. The buddy list response message includes the common transmission information, the local IP address, the buddy ID, the buddy alias, the buddy IP address, the user group, and the client group. , Encryption formula, encryption key, and message presence information is included (S209). Here, the buddy refers to a member client registered with any member client and mutually buddy, and the two member clients can transmit and receive messages according to the present invention.

Next, the member client requests the server to transmit a cryptographic key to be used for sending and receiving e-mail with the buddy. The cipher request message includes common transmission information, a local IP address, and a buddy ID information (S210). . Then, the server transmits a password response message including the encryption formula and encryption key to be used for communication with the buddy to the corresponding member client (S211). This cipher response message includes common transmission information, a local IP address, a buddy ID, and an encryption formula and encryption key information necessary for communication with the buddy. Then, the member client stores the encryption key corresponding to each buddy received from the server in the database. This encryption formula and encryption key are used in the process of authenticating or authenticating the buddy when the member client communicates with any buddy. When the member client sends a message including the encryption key to the buddy, the buddy is the encryption key. If the result is normal, the member client is authenticated. If the result is abnormal, the member client is not authenticated. When a message including an encryption key is transmitted from the buddy, the member client applies the encryption key to the encryption formula and authenticates the buddy if the result value is normal and does not authenticate if it is abnormal.

The member client, which has received the encryption key information necessary for the communication between the buddy list and the buddy through the server, performs a process of checking whether a buddy registered with the buddy is online. An operation flowchart illustrating an operation of performing the operation. First, the member client transmits an online check message to a buddy to send a message. The online check message includes common transmission information, a local IP address, a buddy ID, and an encryption key information (S301). Then, the receiving member client checks its buddy list and if the sending member client is registered as a buddy (S303), sends an online response message to the other party (S304), and if it is not included in its buddy list Quit immediately without responding. This online response message includes its own local IP address, user ID, and encryption key information. Each member client stores the online state of the other buddy in a database.

If the sending member client is not included in the buddy list of the receiving member client as described above, the online check message sent by the sending member client to the receiving member client is ignored as described above, and the sending member client is in the online state of the receiving member client. To check or send and receive e-mail, the receiving member client must register and authenticate the sending member client as a buddy. 4 is an operation flowchart illustrating a process in which a transmitting member client authenticates and registers an arbitrary member client with a buddy.

The sending member client requests authentication from any receiving member client (S401), and determines whether the receiving member client will authenticate the sending member client (S402). If the receiving member client wants to authenticate the transmitting member client, the receiving member client authenticates and registers as a buddy (S403). However, if the receiving member client does not want to authenticate the sending member client, it ends immediately without a response. When the receiving member client authenticates the sending member client, the mutual buddy authentication confirmation of the sending member client and the receiving member client is registered in the server (S404). The server adds the other member client to the buddy list of each member client (S405).

Through these processes, the member client's PC system stores the buddy list, the encryption key information necessary for communication with each buddy, and the online status information of the buddy to which the user wants to send a message.

5 is a flowchart illustrating a process of transmitting a message to a buddy client in which a member client logged into the server is online.

First, any transmitting member client creates a message to be sent to the buddy client and stores it in a mailbox of his PC system (S501). Then, the sending member client transmits a data transmission signal to the receiving buddy client, which includes common transmission information (professional classification, sent date, received date, member ID, user identification, and free space information). In operation S502, an encryption key used to transmit and receive a message with the buddy client is transmitted.

Next, the receiving buddy client transmits the data request message to the transmitting member client (S503). This data request text includes common transmission information (specialization section, sent date, received date, member ID, user classification, and free space information), encryption key used by the buddy client when sending and receiving with the sending member client, and data information. Included. Further, the transmitting member client authenticates the data transmission, and the receiving buddy client accesses the PC system of the transmitting member client to obtain a data receiving message (S504). This data reception message includes common transmission information (specialization section, sent date, received date, member ID, user classification, and free space information), encryption key, and data information.

While the invention has been described above based on the preferred embodiments thereof, these embodiments are intended to illustrate rather than limit the invention. It will be apparent to those skilled in the art that various changes, modifications, or adjustments to the above embodiments can be made without departing from the spirit of the invention. Therefore, the protection scope of the present invention will be limited only by the appended claims, and should be construed as including all such changes, modifications or adjustments.

As described above, according to the present invention, among any two member clients that have given each other the entitlement to send and receive e-mail, the sending member client creates a message, stores it in a mailbox of his PC system, and sends it to the receiving member client. Since the receiving member client receiving the data originating signal and accessing the mailbox of the sending member client directly picks up the message, the sender's rejection and the recipient's rejection cannot be made. Transparency of transmission and reception is guaranteed. In addition, the sending member client and the receiving member client must first authenticate each other with a buddy, and at the time of logon, an encrypted function and an encryption key are received through the server to encrypt and send a message, so that the transmitted and received messages are thoroughly secured. There is an effect that can be maintained. The present invention may be used for document transmission requiring strong encryption, such as payment system, Internet banking system, transmission of important documents, etc., and may be applied to fields such as clustering, VPN, video conferencing, and remote control in the future.

Claims (13)

In an email sending / receiving system in which a server and at least two user clients are connected through a network, an email sending / receiving method between a sending client to transmit a message and a receiving client to receive a message, A first step in which the transmitting client and the receiving client receive encryption information necessary for transmitting and receiving email from the server; A second step of creating an e-mail to be transmitted by the transmitting client, storing the same in an own PC system, and outputting a data transmission signal to the receiving client; and And a third step of the receiving client accessing the PC system of the sending client to receive the recipient authentication and to take the email. The method of claim 1, And before the sending client and the receiving client transmit and receive the email, granting each other an email transmission and reception entitlement. The method of claim 2, The sending client and the receiving client granting each other an e-mail sending and receiving qualification, And the sending client requests authentication from the receiving client, the receiving client authenticates the sending client, and registers a mutual authentication result with the server. The method of claim 2, And checking, by the sending client, an online state of the receiving client after the sending client and the receiving client have qualified each other to send and receive email. The method according to any one of claims 1 to 4, The first step is, A first substep of the user client accessing the server to transmit a connection message for a login request; A second sub-step of the server sending a connection response message including a normal logon result to the user client if the connection message is a normal package and the user client is a valid member; A third sub-step of requesting, by the server, a list of buddies to which the user client has mutually authenticated e-mail transmission and reception, and the server transmitting a buddy list to the user client; And And a fourth sub-step in which the user client requests the server for encryption information necessary for transmitting and receiving e-mail with any buddy on the buddy list, and the server transmits encryption information for each buddy to the user client. E-mail sending and receiving method. In an email transmission / reception system in which a server and at least two user clients are connected through a network, an email transmission method of a transmission client to transmit a message to a reception client, A first step of performing an e-mail transmission and reception authentication process with the receiving client; A second step of receiving encryption information necessary for transmitting and receiving an e-mail with the receiving client from the server, A third step of creating an e-mail to be transmitted to the receiving client and storing the same in an own PC system and outputting a data transmission signal to the receiving client; and And if the data request message is received from the receiving client, authenticating the data request message in response thereto and enabling the receiving client to take the email. The method of claim 6, The first step is, And if the sending client requests authentication from the receiving client and the sending client is authenticated by the receiving client, registering the mutual authentication result with the server. The method of claim 6, The second step, And after receiving the encryption information from the server, checking the online state of the receiving client by using the encryption information. The method according to any one of claims 6 to 8, The second step, A first substep of the transmitting client accessing the server and transmitting a connection message for a login request; A second sub-step of the server sending a connection response message including a normal logon result to the sending client if the connection message is a normal package and the sending client is a legitimate member; A third sub-step, wherein the sending client requests the server for a list of buddies that have mutually authenticated e-mail transmission and reception with the server, and the server transmits a buddy list to the sending client; And A fourth request for the sending client to request encryption information for sending and receiving an e-mail with the receiving client on the buddy list, and the server transmitting encryption information for sending and receiving e-mail with the receiving client to the sending client. An e-mail transmission method comprising a small step. In an e-mail sending / receiving system in which a server and at least two user clients are connected through a network, to a sending client to send a message to a receiving client, A first step of performing an e-mail transmission and reception authentication process with the receiving client; A second step of receiving encryption information necessary for transmitting and receiving an e-mail with the receiving client from the server, A third step of creating an e-mail to be transmitted to the receiving client and storing the same in an own PC system and outputting a data transmission signal to the receiving client; and Receiving a data request message from the receiving client, in response thereto, authenticating the data request message and recording a program for executing the email transmission method comprising the fourth step of allowing the receiving client to take the email. Computer-readable recording media. In an e-mail transmission and reception system configured by connecting a server and at least two user clients through a network, the e-mail receiving method of a receiving client receiving a message from a sending client, A first step of performing an e-mail transmission and reception authentication process with the sending client; A second step of receiving encryption information necessary for transmitting and receiving an email with the sending client from the server, A third step of, upon receiving the data transmission signal from the transmitting client, authenticating the data transmission signal and transmitting a data request message to the transmitting client in response thereto; and And in response to the data request message being authenticated by the sending client, accessing the PC system of the sending client to retrieve the email. The method of claim 10, The second step, A first substep of the receiving client accessing the server and transmitting a connection message for a login request; A second sub-step of the server sending a connection response message including a normal logon result to the receiving client if the connection message is a normal package and the receiving client is a legitimate member; A third sub-step of requesting, by the receiving client, a list of buddies that have mutually authenticated e-mail transmission and reception with the server, and the server transmitting a buddy list to the receiving client; And A fourth request for the receiving client to request encryption information necessary for transmitting / receiving an e-mail with the transmitting client on the buddy list, and the server transmitting the encryption information required for transmitting / receiving an e-mail with the transmitting client to the receiving client. E-mail receiving method comprising a small step. In an email sending / receiving system in which a server and at least two user clients are connected through a network, the receiving client receives a message from the sending client, A first step of performing an e-mail transmission and reception authentication process with the sending client; A second step of receiving encryption information necessary for transmitting and receiving an email with the sending client from the server, A third step of, upon receiving the data transmission signal from the transmitting client, authenticating the data transmission signal and transmitting a data request message to the transmitting client in response thereto; and When the data request message is authenticated by the sending client, in response to the data request message, the computer may record the program for executing the email receiving method including the fourth step of accessing the PC system of the sending client to retrieve the email. Recording media.