Key digital identification method using once variable quantity

Abstract

Using message authentication code (MAC) to authenticate message, the invention uses one-off variable. The method includes steps: before using one-off variable, saving range and use state of one-off variable; it must carry out operation for one-off variable and message together to calculate MAC; in authenticating MAC, must authenticate one-off variable, and its state; after using one-off variable, must mark and save use state; for certain cipher key and authentication function, one-off variable is only use for once to authenticate message effectively. Using one-off variable can realize integrality and freshness of authenticating message. Advantages are: synchronous use one-off variable to prevent security attack in many ways, and simple method for realizing complicated authentication application.

Description

technical field [0001] This solution belongs to the field of information technology security and involves information security certification services: identity certification, information integrity and freshness certification. Background technique [0002] Identity authentication methods usually include identity certificates, seals, or handwritten signatures. These authentication methods are usually physical authentication, using manual identification, which is easy to be forged, difficult to distinguish, and inconvenient for information exchange. Usually not used as digital information exchange and authentication. [0003] At present, many applications often use user ID and simple password authentication, which is easy to lose confidentiality and be faked. [0004] The authentication of digital information usually uses a message authentication code (MAC, or called a message authentication checksum), which is to generate a fixed-length short data block by using a key to comb...

AI Technical Summary

Problems solved by technology

[0006] (2) It is certain that the sender has generated this message