Fault tolerance key agreement method based on cell group design

Abstract

The invention discloses a fault tolerance key agreement method based on cell group design. The cell group design technology is applied to key agreement. The double linear mapping and the encryption technique based on an identity are used, so that the key agreement method obtains efficient operation performance and efficient fault tolerance capability and can obtain good expansion performance in a dynamic environment. The method includes the step of constructing symmetrical balance incomplete cell groups and the step of two-round key agreement. By means of the design of the symmetrical balance incomplete cell groups, contributions to the shared key by each participant are balanced, no participants can force pre-selection or forecasting of the key and good safety is achieved. In addition, differential key attack is avoided and even if a vicious participant uses two kinds of different sub-keys, the vicious participant can still be identified and removed. After the vicious participant is removed, an available participant is used for replacing the cancelled vicious participant to rapidly carry out new key agreement and good expansibility is achieved.

Description

technical field [0001] The invention belongs to the technical field of information security, in particular to a fault-tolerant key negotiation method based on block design. Background technique [0002] With the continuous development of key agreement technology, the fault tolerance of the negotiation method has received more and more attention and research. In practical applications, with the increase of negotiation participants, some malicious participants will inevitably appear. It is possible for a malicious actor to delay or corrupt session key generation, thereby preventing session establishment. Most of the current key agreement methods are based on honest and credible participants. Once there are malicious participants, or some honest and credible participants become malicious participants due to capture attacks (physical attacks) Otherwise, the negotiation will fail, and the session will be delayed or interrupted, which will lead to serious consequences and huge l...

AI Technical Summary

Problems solved by technology

Although the fault-tolerance of key negotiation has received a certain degree of attention in recent years, how to achieve high-efficiency fault-tolerance, fast recovery, and ability to resist differential key attacks has not been studied in depth, which will seriously limit the security of encryption. Practical application of key negotiation, and may cause delay, destruction and leakage of high-level sessions

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