Realizing method of security symmetric coding algorithm
A symmetric encryption algorithm and symmetric encryption algorithm technology, applied in the field of encryption, wired or wireless secure communication, can solve the problems of high manufacturing cost, increase in key management cost, reduce the confidentiality strength of cryptographic products, etc., and achieve the effect of reducing management cost.
Active Publication Date: 2012-07-04
北京中电数安科技有限责任公司
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[0002] At present, among the encryption products produced by some encryption equipment manufacturers at home and abroad, one is that the symmetric encryption algorithm is fixed and will not change. In order to improve the security strength of the encryption machine, the user constantly changes the key. The change of the key reaches one encryption at a time, which will increase the cost of key management. If the symmetric encryption algorithm is made public, the confidentiality of the encryption product will be reduced; another encryption product is to store multiple symmetric keys in an encryption system. Encryption algorithm, the communication parties negotiate before each use, and select one from a variety of symmetric encryption algorithms, which is equivalent to having a variety of encryption devices with different symmetric encryption algorithms, and choose one to use each time. This multi-algorithm system Cryptographic products are too expensive to manufacture
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[0027] The implementation steps of a confidential symmetric encryption algorithm are illustrated below in conjunction with the accompanying drawings:
[0028] figure 1: To illustrate the process of establishing a confidential symmetric encryption algorithm. First of all, for a specific set of symmetric encryption algorithms, determine K kinds of K=1~6 programming "elements" as variable programming "elements", and carry out the K kinds of programming "elements". Extended changes, the generated compilation "elements" have the following characteristics: the same type of compilation "elements" have the same structure but different parameters, and different types of compilation "elements" have completely different structures, and the parameters of these compilation "elements" are tested with strong password methods , so that it has the characteristics of strong password coding "elements", and then test the parameters of these coding "factors" separately to make them have the charac...
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The invention is based on symmetric encryption algorithm. It modifies the composing elements in the symmetric encryption algorithm such as feedback shift register, cipher key expanding algorithm, table and function to make them to become dynamic elements. The dynamic elements vary randomly, and are controlled and selected by a group of random number and time stamp to ensure the variation of composition of encrypted data file. The random number is defined to session key. The public key of recipient is used to encrypt the session key and time stamp into cipher text, and then the cipher text is sent to recipient to reach the purpose of converting the composition of symmetric encryption algorithm to a security composition.
Description
Technical field: [0001] The invention relates to the field of cryptographic technology, and uses cryptographic coding technology to design a secret symmetric cryptographic algorithm, which is suitable for wired or wireless secure communications in government, military, financial, commercial and other industries. Background technique: [0002] At present, among the encryption products produced by some encryption equipment manufacturers at home and abroad, one is that the symmetric encryption algorithm is fixed and will not change. In order to improve the security strength of the encryption machine, the user constantly changes the key. The change of the key reaches one-time encryption, which will increase the cost of key management. If the symmetric cryptographic algorithm is made public, the confidentiality of the cryptographic product will be reduced; another cryptographic product is to store multiple symmetric Encryption algorithm, the communication parties negotiate before...
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IPC IPC(8): H04L9/28
Inventor 胡祥义
Owner 北京中电数安科技有限责任公司