File Encryption and Decryption Method and System Based on Chaotic Transformation

Abstract

Provided is a file encryption method based on chaos transformation. The file encryption method comprises: (a1) preprocessing a password for encrypted content; (a2) extracting a group of plaintext data and generating the initial values of a group of vertificaiton codes; (a3) obtaining a second iteration coefficient and the number of second iteration times; (a4) executing secret key iteration and generating an iteration result according to the second iteration coefficient and the number of second iteration times; (a5) performing xor operation on the iteration result and the plaintext data; (a6) generating a verification code according to the plaintext data; (a7) writing the result of the xor operation in a file and generating a cryptograph; (a8) determining whether the secret key iteration is executed to the tail portion of the encrypted content, and executing a step (a9) if yes or continuously executing the step (a4) if not; (a9) the successive iteration result of the plaintext data and all the iteration results are converted into integers and the encryption key generated by the last next iteration is saved in the tail of the encrypted content.

Description

technical field [0001] The invention relates to the technical field of information security, in particular to a method and system for rapidly encrypting and decrypting files, and is applicable to fields such as mobile phones, notebooks, and tablet computers that need to keep private files secret. Background technique [0002] In a computer, a file is an organizational form of data. In order to ensure the security of the file during storage, transmission and use, it must be encrypted. Encryption is generally implemented through a cryptographic system. The cryptographic system encrypts the original information and decrypts the encrypted information based on mathematical principles. At present, there are mainly two ways to encrypt files: authentication-based password encryption and file content encryption. The authentication-type password encryption refers to proving the user's identity according to the password information known to the user, for example, a static password, a...

AI Technical Summary

Problems solved by technology

The identity-based password encryption is relatively easy to crack, and file content encryption has problems such as slow encryption and decryption speed and insufficient encryption strength.

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