Data encipher and decipher system based on dynamic variable-length code

Abstract

The invention relates to an information security technology in information technology field, which concretely relates to binary code and decode of data. The invention belongs to sequence coding system; the essence is periodless multi-table code substituting method. It uses dynamic length variable code technology, a group of input data with fixed length (8 bits), the length of the output code is between 1 and 255, the size of the encrypted text is determined according to the state of the coding system. The state of the system will change after coding a group of plain text, and the initial state of the system is determined by the user key, the code analyzer is hard to determine the relation between the encrypted text and the plain text, thus the attacking method to each kind of system can be resisted effectively.

Description

technical field

[0001] The invention relates to information security technology in the field of information technology, in particular to encryption and decryption of binary coded data. Background technique

[0002] Cryptography technology is the core technology in information security technology, which mainly includes encryption technology, authentication technology and key management technology. Encryption technology is an important means to realize information confidentiality. The so-called encryption is to use mathematical methods to re-encode the original data, so that anyone other than the legal receiver (using the correct key) can restore the original "message" - plaintext, or read the changed "message" "—Ciphertext, are very difficult. According to whether the keys used for encryption and decryption are the same, cryptosystems can be divided into symmetric cryptosystems and public key cryptosystems. The present invention belongs to the symmetric encryption system. ...

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