TWI483606B - System and method for protecting the phone files - Google Patents

Description

Mobile phone file protection system and method

The invention relates to a file protection system and method, in particular to a mobile phone file protection system and method.

With the development of communication technology, the capacity of mobile phone memory cards and the capacity of mobile phone memory have been greatly improved. The user can store the personal data or company data in the mobile phone, and manage various files such as videos, pictures, ring tones, text files, etc. through the file management function in the mobile phone. However, important files in the mobile phone may be leaked due to unexpected situations such as the loss of the mobile phone, causing losses to the user. In response to this situation, many technologies for encrypting files have been introduced, and the specified files in the mobile phone are encrypted, so that others cannot obtain the information in the encrypted files. However, the traditional replacement and replacement encryption technology always produces the same ciphertext for the same plaintext, and is easy to crack by frequency statistics, and the security is low. While DES (Data Encryption Standard), 3DES, AEC and other encryption technologies are highly secure, the algorithm is too complicated and has a large overhead on embedded systems.

In view of the above, it is necessary to provide a mobile phone file protection system, which utilizes the uniqueness of the IMEI code of the mobile phone to encrypt and protect the mobile phone file, and the algorithm is simple and safe.

It is also necessary to provide a mobile phone file encryption method, which utilizes the uniqueness of the IMEI code of the mobile phone to encrypt and protect the mobile phone file, and the algorithm is simple and safe.

The mobile phone file protection system comprises: a reading module, configured to read the IMEI code of the mobile phone and the plaintext in the file in a binary manner when the mobile phone file needs to be encrypted; the computing module is used for The read IMEI code is encrypted with the read plaintext to obtain a ciphertext corresponding to the plaintext, and the encryption operation is performed by looping the respective bytes of the plaintext and the decimals of the digits constituting the IMEI code. The binary number corresponding to the number is XORed; the write module is used to delete the plaintext in the file, and the ciphertext is written into the file.

The mobile phone file protection method comprises the following steps: (a) when the mobile phone file needs to be encrypted, the IMEI code of the mobile phone and the plaintext in the file are read in a binary manner; (b) the IMEI code read is read. Performing an encryption operation on the read plaintext to obtain a ciphertext corresponding to the plaintext, and the encryption operation is performed by looping each byte of the plaintext with a binary corresponding to each decimal digit constituting the IMEI code. The number is XORed; (c) the plaintext in the file is deleted, and the ciphertext is written into the file.

Compared with the prior art, the present invention utilizes the uniqueness of the IMEI code of the mobile phone to encrypt and protect the mobile phone file, and the algorithm is simple and high in security.

Referring to FIG. 1, it is an operating environment diagram of a preferred embodiment of the mobile phone file protection system of the present invention.

The file protection system 10 runs in a mobile phone 1, which also includes a memory 11 and a CPU 12. The memory 11 stores various files such as videos, ring tones, text files, pictures, and the like. The file 110 is the file that the user wants to encrypt and protect. The memory 11 further includes a buffer 111 for storing an intermediate result of the file protection system 10 encrypting the file 110 or decrypting the encrypted file 110.

Referring to FIG. 2, it is a functional module diagram of the mobile phone file encryption system of the present invention. The file protection system 10 includes a verification module 101, a reading module 102, a computing module 103, and a writing module 104. When the user needs to encrypt the file 110, a set of encrypted passwords are input into the mobile phone 1, and the encrypted password is used when the decrypted password input by the user is consistent with the encrypted password when the encrypted file 110 needs to be decrypted. Judging allows the decryption operation to be performed on the archive 110.

The verification module 101 is used to preset a legal rule for encrypting a password. For example, the encrypted password cannot contain blank characters, and the length of the encrypted password cannot exceed 32 bits.

The reading module 102 is configured to read the encrypted password input by the user.

The verification module 101 is further configured to verify whether the read encrypted password is legal according to a preset legal rule of the encrypted password. If the encrypted password does not comply with the preset legal rules, the encrypted password is considered invalid.

The reading module 102 is further configured to store the encrypted password in the memory 11 when the encrypted password is legal.

The reading module 102 is further configured to read the IMEI (International Mobile Equipment Identification Number) code of the mobile phone 1 in a binary manner. The IMEI code consists of 15-bit 0~9 digits and is a distinguishing mobile device. It is stored in the mobile device, and each mobile device corresponds to a unique IMEI code in the world.

The reading module 102 is further configured to read the content in the file 110 to be encrypted, that is, plain text, in a binary manner.

The operation module 103 is configured to perform an encryption operation on the read IMEI code and the read plaintext to obtain a ciphertext corresponding to the plaintext. The encryption operation is performed by performing an exclusive OR operation on each of the byte groups of the plaintext and the binary digits corresponding to the decimal digits constituting the IMEI code.

Specifically, the first byte of the plaintext is subjected to an exclusive OR operation with the binary digit corresponding to the first decimal digit of the IMEI code, and the first set of XOR result is stored in the buffer 111, and the The second byte of the plaintext performs an exclusive OR operation with the binary digit corresponding to the second decimal digit of the IMEI code, and the second set of XOR result is also stored in the buffer 111, and so on, when the plaintext is The fifteenth byte of the IMEI code performs an exclusive OR operation on the binary digit corresponding to the fifteenth decimal digit of the IMEI code, and stores the fifteenth group XOR result in the buffer 111, and then the plaintext The sixteenth byte performs an exclusive OR operation with the binary digit corresponding to the first decimal digit of the IMEI code, and stores the sixteenth XOR result in the buffer 111, and sequentially loops until the plaintext After all the byte groups perform an exclusive OR operation with the corresponding binary digits in the IMEI code, the sequenced XOR result stored in the buffer 111 is the plaintext encrypted ciphertext. For example, the pre-encryption file 110 is a text file, and the text file has a paragraph "I am an engineer", and after the encryption, the words in the text file become an incomprehensible coding information, that is, the original content is realized. Encryption.

The write module 104 is configured to delete the plaintext in the file 110, and write the ciphertext in the buffer 111 into the file 110 to complete the encryption of the file 110.

When the encrypted file 110 needs to be decrypted, the user inputs a set of decrypted passwords in the mobile phone 1, and the reading module 102 is further configured to read the decrypted password and read the encrypted file 110 from the memory 11. Encrypted password.

The verification module 101 is further configured to verify whether the decrypted password is consistent with the encrypted password.

The reading module 102 is further configured to read the ciphertext in the file 110 in a binary manner and read the IMEI code of the mobile phone 1 in a binary manner when the decrypted password is consistent with the encrypted password.

The operation module 103 is further configured to perform a decryption operation on the read IMEI code and the read ciphertext to obtain a plaintext corresponding to the ciphertext. The decryption operation is an inverse operation of the encryption operation, and the operation method is: performing an exclusive OR operation on each of the byte groups of the ciphertext and the binary digit corresponding to each of the decimal digits constituting the IMEI code.

Specifically, the first byte of the ciphertext is subjected to an exclusive OR operation with the binary digit corresponding to the first decimal digit of the IMEI code, and the first set of XOR result is stored in the buffer 111, and The second byte of the ciphertext performs an exclusive OR operation with the binary digit corresponding to the second decimal digit of the IMEI code, and the second set of XOR result is also stored in the buffer 111, and so on. The fifteenth byte of the ciphertext performs an exclusive OR operation with the binary digit corresponding to the fifteenth decimal digit of the IMEI code, and stores the fifteenth group XOR result in the buffer 111, and then Performing an exclusive OR operation on the sixteenth byte of the ciphertext and the binary digit corresponding to the first decimal digit of the IMEI code, and storing the sixteenth group XOR result in the buffer 111, and sequentially looping After all the bytes of the ciphertext are XORed with the corresponding binary digits in the IMEI code, the sequenced XOR result stored in the buffer 111 is the ciphertext decrypted. The plaintext is also the content in the file 110 before being encrypted.

The write module 104 is further configured to delete the ciphertext in the file 110, and write the plaintext in the buffer 111 into the file 110 to complete decryption of the encrypted file 110.

Referring to FIG. 3, it is a flow chart of a preferred embodiment of a method for encrypting a mobile phone file. Before proceeding to step S11, the verification module 101 first presets a legal rule for encrypting the password.

In step S11, the reading module 102 reads the encrypted password input by the user.

In step S12, the verification module 101 verifies whether the read encrypted password is legal according to the preset legal rule of the encrypted password. If the encrypted password is valid, the process proceeds to step S13, and if the encrypted password is invalid, the process ends.

In step S13, the reading module 102 stores the encrypted password in the memory 11.

In step S14, the reading module 102 reads the IMEI code of the mobile phone 1 in a binary manner.

In step S15, the reading module 102 reads the content in the file 110 to be encrypted, that is, the plaintext, in a binary manner.

In step S16, the operation module 103 performs an encryption operation on the read IMEI code and the read plaintext to obtain a ciphertext corresponding to the plaintext. The encryption operation is performed by performing an exclusive OR operation on each of the byte groups of the plaintext and the binary digits corresponding to the decimal digits constituting the IMEI code.

In step S17, the writing module 104 deletes the plaintext in the file 110, and writes the ciphertext into the file 110.

Referring to FIG. 4, it is a flow chart of a preferred embodiment of a method for decrypting a mobile phone file. In this embodiment, the encrypted file 110 needs to be decrypted.

In step S21, the reading module 102 reads the decryption password input by the user, and reads the encrypted password corresponding to the encrypted file 110 from the memory 11.

In step S22, the verification module 101 verifies whether the decrypted password is consistent with the encrypted password. If the decrypted password matches the encrypted password, the process proceeds to step S23, and if the decrypted password does not match the encrypted password, the flow is terminated.

In step S23, the reading module 102 reads the IMEI code of the mobile phone 1 in a binary manner.

In step S24, the reading module 102 reads the ciphertext in the file 110 in a binary manner.

In step S25, the operation module 103 decrypts the read IMEI code and the read ciphertext to obtain a plaintext corresponding to the ciphertext. The decryption operation is performed by performing an exclusive OR operation on each of the byte sets of the ciphertext and the binary number corresponding to each of the decimal digits constituting the IMEI code.

In step S26, the writing module 104 deletes the ciphertext in the file 110, and writes the plaintext into the file 110.

In summary, since the IMEI code has the unique feature of the whole world, the content in the file 110 is encrypted by the IMEI code of the mobile phone 1, so that the same plaintext can generate different ciphertexts on different mobile phones, and at the same time, the encrypted archive content Unable to be understood, improving the security of encrypted files. When the user needs to use the encrypted file 110, the content of the file 110 can be quickly decrypted into the content before being encrypted by inputting the decryption password in accordance with the encrypted password.

In summary, the present invention complies with the requirements of the invention patent and submits a patent application according to law. The above is only the preferred embodiment of the present invention, and the scope of the present invention is not limited to the above-described embodiments, and equivalent modifications or variations made by those skilled in the art in light of the spirit of the present invention are It should be covered by the following patent application.

1. . . Mobile phone

10. . . File protection system

11. . . Memory

110. . . file

111. . . Buffer

12. . . CPU

101. . . Verification module

102. . . Read module

103. . . Computing module

104. . . Write module

1 is a diagram showing the operating environment of a preferred embodiment of the mobile phone file protection system of the present invention.

2 is a functional block diagram of the mobile phone file protection system of the present invention.

3 is a flow chart of a preferred embodiment of a method for encrypting a mobile phone file.

4 is a flow chart of a preferred embodiment of a method for decrypting a mobile phone file.

10. . . File protection system

101. . . Verification module

102. . . Read module

103. . . Computing module

104. . . Write module

Claims (9)

A mobile phone file protection system, the system comprising:
The reading module is configured to read the IMEI code of the mobile phone and the plaintext in the file in a binary manner when the mobile phone file needs to be encrypted;
The operation module is configured to perform an encryption operation on the read IMEI code and the read plaintext to obtain a ciphertext corresponding to the plaintext, and the operation method of the encryption operation is to loop back the individual bytes of the plaintext. And performing an exclusive OR operation on the binary digits corresponding to the decimal digits of the IMEI code;
The write module is used to delete the plaintext in the file, and the ciphertext is written into the file. The mobile phone file protection system of claim 1, wherein the reading module is further configured to read an encrypted password input by a user. For example, in the mobile phone file protection system described in claim 2, the system further includes a verification module for presetting the legal rules of the encrypted password, and verifying the read according to the legal rules of the preset encrypted password. Whether the encrypted password is legal. If the encrypted password read meets the preset legal rules, the encrypted password is legal. The mobile phone file protection system of claim 3, wherein the reading module is further configured to store a legal encrypted password in a memory of the mobile phone. The mobile phone file protection system according to claim 4, wherein the reading module is further configured to read a decryption password input by the user and read from the memory when the encrypted mobile phone file needs to be decrypted. Take the encrypted password corresponding to the file;
The verification module is further configured to verify whether the decrypted password is consistent with the encrypted password;
The reading module is further configured to: when the decrypted password is consistent with the encrypted password, read the ciphertext in the file in a binary manner, and read the IMEI code of the mobile phone in a binary manner;
The operation module is further configured to perform a decryption operation on the read IMEI code and the read ciphertext to obtain a plaintext corresponding to the ciphertext, and the operation method of the decryption operation is each bit of the ciphertext The group loop performs an exclusive OR operation with the binary digits corresponding to the decimal digits of the digits constituting the IMEI code;
The write module is further configured to delete the ciphertext in the file, and write the plaintext into the file. A mobile phone file protection method, the method comprising the following steps:
(a) When the mobile phone file needs to be encrypted, the IMEI code of the mobile phone and the plaintext in the file are read in binary mode;
(b) Encrypting the read IMEI code with the read plaintext to obtain a ciphertext corresponding to the plaintext, and the encryption operation is performed by looping the respective bytes of the plaintext and composing the IMEI. XOR operation of the binary digits corresponding to the decimal digits of the code;
(c) Delete the plaintext in the file and write the ciphertext into the file. The method for protecting a mobile phone file as described in claim 6 of the patent application, before the step (a), further includes:
The legal rules for presetting encrypted passwords. For the mobile phone file protection method described in claim 7, the step (a) further includes:
(a1) reading the encrypted password input by the user;
(a2) verifying whether the encrypted password read is legal according to the legal rule of the preset encrypted password. If the encrypted password is legal, the encrypted password is stored in the memory of the mobile phone. If the encrypted password is invalid, Then the process ends. The mobile phone file protection method according to claim 8, wherein the method further comprises the step of decrypting the encrypted mobile phone file:
(d1) reading the decryption password input by the user, and reading the encrypted password corresponding to the file from the memory;
(d2) verifying whether the decrypted password is consistent with the encrypted password, and if the decrypted password is consistent with the encrypted password, proceeding to step (d3), if the decrypted password is inconsistent with the encrypted password, ending the flow;
(d3) reading the IMEI code of the mobile phone and the ciphertext in the file in a binary manner;
(d4) decrypting the read IMEI code and the read ciphertext to obtain a plaintext corresponding to the ciphertext, the decrypting operation is to loop back and form each byte of the ciphertext XOR operation of the binary digits corresponding to the decimal digits of the IMEI code;
(d5) Delete the ciphertext in the file and write the plaintext into the file.