A kind of encryption method and device

Abstract

The invention discloses an encryption method based on characters. The method comprises steps of building a basic transposition table?TB and using a secret key to initialize the basic transposition table to an operation transposition table?TO, converting an input character string into a plaintext sequence number string according to a pre-defined character and sequence number corresponding?table TC, using the operation transposition table?TO for carrying out transposition on the plaintext sequence number string to obtain a ciphertext sequence number string, and converting the ciphertext sequence number string into a ciphertext character string. According to the method, a character?position services as a basic processing unit, dynamic variable data length encryption is realized, length?consistency and?visibility of the ciphertext and the plaintext can be ensured, and platform adaptability and high calculation efficiency are realized.

Description

technical field [0001] The invention relates to the technical field of information security and encryption, in particular to a method for forming an encryption code to protect information by using a computer and coding technology. Background technique [0002] With the rapid development and wide application of computer and data communication technology, the society relies more and more on the safe storage, safe processing and safe transmission of information, and the issue of information security protection becomes more important. Reliable encryption methods can make some sensitive and confidential information safely stored or transmitted on media without protective measures. [0003] Although traditional encryption methods such as DES and AES have strong encryption performance and the ability to prevent cracking, they are all byte-based encryption methods, and the encryption results will make the ciphertext into unrecognizable characters. These characters are If it cannot ...

AI Technical Summary

Problems solved by technology

Secondly, in the traditional encryption method, - each input plaintext must be fixed-length data

To achieve variable-length encryption, it can only be achieved by padding data bits and repeatedly encrypting different plaintext segments repeatedly, which obviously cannot meet the performance requirements

[0004] For the above-mentioned problems existing in related technologies, effective solutions have not yet been proposed

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