Method for obtaining safe information abstract in authentication header

Abstract

The invention relates to a modified SHA-1 hash algorithm. The existing SHA-1 harsh algorithm has low security. The invention firstly adds a 1, a plurality of 0 and a 64-bit binary string after the information to be processed, then enlarges and groups the information, so the original 512-bit group is changed into a 1024-bit group and a register value is initialized; then a main cycle is utilized to sequentially process each group, the main cycle totally has four operations, and each operation contains logical function and compression function processing; and finally, after the processing of all the groups is completed, 160-bit message digest is output, and when the message digest is transferred, the message to be transferred is added with a safety hashed value. Through the algorithm of theinvention, the original SHA-1 algorithm has more safety on message processing, and through modifying the logical function expression and the compression function logical structure of the algorithm, the efficiency of the SHA-1 algorithm is improved.

Description

Technical field [0001] The invention belongs to the technical field of network security, and specifically relates to a method for obtaining a security message digest in an authentication protocol. Background technique [0002] Digital signature is an important information security technology. It is widely used in the field of network information exchange. In many types of digital signature technologies, a special type of mathematical algorithm-hash algorithm is usually used. It occupies an extremely important position in the signature technology. At present, the common hash algorithms are MD5, SHA-1 and RIPEMD-160, and China tends to use MD5 and SHA-1. From the current point of view, SHA-1 has become the most widely used algorithm due to its advantages in security strength and computational efficiency. [0003] The SHA-1 algorithm was designed by the National Institute of Standards and Technology and the National Security Agency, and was adopted by the U.S. government as the U.S....

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Problems solved by technology

In addition, although the security of SHA-1 is constantly being challenged, the huge amount of calculation required to crack the algorithm is meaningless for the current hardware level.

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