A ciphertext preservation method under carrier damage

Abstract

The invention discloses a method for preserving ciphertext when a carrier is damaged, and relates to the technical field of information security. The ciphertext information is hidden by means of the least significant bit LSB algorithm, and has the advantages of simple implementation and large amount of embedded information. Since the image has been embedded with encrypted information, it cannot be distinguished by naked eyes alone, thus ensuring the security of secret information transmission. On this basis, the sender can arbitrarily choose a 24-bit bmp image as a carrier, use the idea of ​​maximum likelihood probability to store information, and use (7,3) cyclic codes to perform error control coding on the carrier format information sequence for storing ciphertext, Even if the image is damaged due to a certain degree of cropping during the communication process, the receiver can ensure the recovery of the ciphertext information embedded in the image through its own error detection and correction capabilities, thus to a certain extent overcome the robustness of the LSB algorithm to store information. The shortcomings of poor performance greatly enhance the reliability of information transmission.

Description

technical field [0001] The invention relates to the technical field of information security, in particular to a method for preserving ciphertext when a carrier is damaged. Background technique [0002] From ancient times to the present, the problem of information security in human society has been a long-lasting problem. In ancient my country, in the form of Tibetan-initial poems and Tibetan-tail poems, the meaning and "secret words" to be expressed were hidden in specific positions in poems or pictures. Crack the hidden information in it, so as to achieve the purpose of information hiding. [0003] In today's society, with the development of network technology and multimedia technology, people pay more and more attention to multimedia technology, and our life has become increasingly exciting due to the development of digital information, such as various multimedia digital products Greatly enrich our life. Because multimedia has the characteristics of being reproducible an...

AI Technical Summary

Problems solved by technology

However, cryptographic technology also has its own problems. For example, secret information is coded to generate garbled characters, which is easy to be discovered by others, attacking and destroying; It is required that the authentication information can be directly embedded in the multimedia data, but it is difficult to achieve this in cryptographic technology. Moreover, the authenticity authentication of multimedia content often needs to endure a certain degree of distortion. However, cryptographic technology often does not allow any bit change.

[0005] Traditional encryption technology can no longer meet people's needs, so information hiding technology is born as a new information security technology application.

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