Dynamic stream ciphering and deciphering method based on broad sense information field

Abstract

The invention provides a system for encrypting and deciphering a dynamical flow based on a generalized information field, wherein the system that can realize the method comprises a PRG (Pseudorandom Code Generator) connected with the system and based on the generalized information field, and an encryption and decryption subsystem; the encryption and decryption subsystem comprises a size control module of a dynamic buffering area, a locus ring conversion and matrix generation module, a flow encryption module and a flow decryption module; the PRG (Pseudorandom Code Generator) comprises an IV generation module, an IV normalization module, an m module, a constrained processing module, a key length judgment module, a physical reconfiguration module and a logical reconfiguration module; the PRG (Pseudorandom Code Generator) is respectively connected with the size control module of the dynamic buffering area, the flow encryption module and the flow decryption module; and the flow encryption module and the flow decryption module are connected with the m module through a transfer entrance. The system realizes locus ring conversion and flow encryption in a conventional activity background space between both sides of encryption and decryption, overcomes the problem of the periodic property of a normal key flow generator, achieves 'one word one cipher', and has strong resistance to conventional cipher analysis.

Description

technical field [0001] The invention relates to the field of cryptography, in particular to a dynamic stream encryption and decryption method based on a generalized information domain. Background technique [0002] In recent years, computer network has developed rapidly and is widely used in various fields such as politics, military affairs, economy and science, and more and more information has been effectively transmitted and stored. Due to the openness of the computer network, information may be stolen in the process of transmission and storage, and the confidentiality, integrity, availability and non-repudiation of information all need to be realized by cryptographic technology. Modern high-performance computers can automatically analyze and intercept transmitted information, and can search hundreds of bottom codes per second, thus posing a serious threat to information security. The information field is eager to have more secure, convenient and effective means of infor...

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Problems solved by technology

Therefore, the security problem of the algorithm depends on the security problem of m and IV

[0009] (2) The encryption algorithm of the stream cipher mostly uses XOR, so it is relatively simple compared with block encryption, and has a higher dependence on the key generator, but the actual key stream generator cannot completely avoid periodicity

[0010] (3) The same key is often used repeatedly in the actual use process, and there are security problems caused by multiple reuse

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