GB/T 15843.2-2017 Information technology—Security techniques—Entity authentication—Part 2:Mechanisms using symmetric encipherment algorithms

Scope

This part of GB/T 15843 specifies the entity authentication mechanism using symmetric encryption algorithms. Among them, there are four authentication mechanisms without the involvement of a trusted third party between two entities. Two of these mechanisms are one-way authentication from one entity to another, and the other two are mutual authentication between two entities. The remaining mechanisms all require the involvement of a trusted third party to establish a common secret key and achieve mutual or one-way entity authentication. The mechanisms specified in this part use time-varying parameters such as timestamps, serial numbers, or random numbers to prevent previously valid authentication information from being accepted or repeatedly accepted. If there is no trusted third party involved and timestamps or serial numbers are used, only one message needs to be transmitted for one-way authentication, while two messages are required for mutual authentication. If there is no trusted third party involved and a challenge-response method using random numbers is used, two messages are required for one-way authentication and three messages are required for mutual authentication. If a trusted third party is involved, any additional communication between an entity and the trusted third party requires two additional transmissions during the communication exchange.

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