Encryption and decryption method of ciphertext

Abstract

The invention discloses an encryption and decryption method of a ciphertext. According to the method, a randomness database of family names and given names is produced; a secret key which is generated by a plaintext through a symmetric encryption algorithm and a secret key generator is encrypted and is generated into ciphertext messy code; the messy code is segmented and filled, then is converted into an address book and then is generated into the original plaintext by an inverse converter. According to the method, the plaintext is hidden in the address book text; the plaintext information is hidden; the encryption information is hidden; dual security guarantee is realized; encryption and encryption hide of the plaintext information are realized; the ciphertext messy code encrypted by a security encryption algorithm is hidden in the text; the high redundancy demands on videos and pictures are solved; the conversion efficiency is very high; there is no any demand on the original information; and the realization technique of generating the meaningful ciphertext is independent of the format of the text and is more flexible.

Description

technical field [0001] The invention relates to a method for encrypting and decrypting ciphertext, and belongs to the technical field of information communication security. Background technique [0002] Using text as a carrier is to achieve information embedding by changing some features or formats of the text, and it is required that this embedding operation will not cause a gap in human vision. But text files have little room for redundancy, especially unformatted plain text documents. Text information is the most commonly used information transmission method; [0003] Information hiding with text as the carrier usually has the following categories: basic file structure, text-based sorting format, and natural language-based processing methods. [0004] A method based on the structure of the document, which is independent of the text itself. It mainly involves file structure features, such as the redundant space in the cross-reference table of the PDF document and the st...

AI Technical Summary

Problems solved by technology

[0010] In principle, although this method applies the coding principle, it avoids the limitation that the existing information hiding method with text information as the carrier must rely on a specific file format. However, this method can only embed the hidden information in the originally meaningful text. information, rather than hiding information and transforming the structure and content of the original information;

[0011] The information hiding of the grammatical and semantic method is generally hidden by the replacement of synonyms. This method has extremely strict requirements on the difference in meaning of words, and due to the limited size of the dictionary of synonyms, the embedding rate and security are not very high.

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