A leak-resistant group key agreement system and method in group communication

Abstract

The invention discloses a leak-resistant group key negotiation system and method in group communication. There are n users in the system, and all users share a password pw; , random oracle; protocol participants are networked devices participating in the protocol; adversary is a probabilistic polynomial time algorithm, through which to simulate various attacks that may occur in the network; information obtained from . In the present invention, the system is initialized at first, and then each protocol participant calculates independently, then each protocol participant combines calculations, and finally each protocol participant generates a common session key; the present invention realizes group encryption while resisting leakage attacks Key agreement is very practical; a high-quality key agreement protocol based on password authentication is proposed, which improves the efficiency of the scheme.

Description

technical field [0001] The invention belongs to the technical field of information security, and relates to a group key negotiation system and method against leakage in group communication, in particular to the characteristics of the group communication field, the needs of users for security, and the needs of convenience and efficiency. A group key agreement system and method based on password authentication with anti-leakage attack capability. Background technique [0002] With the extensive application of online collaborative work, video conference, grid computing, online games, online teaching and other services, group communication services on public networks are increasing day by day. In these applications, the number of group members may reach tens or hundreds. In the case of a large number of group members, a crucial issue is how to ensure the security of communication among group members, and the core of this problem is how to exchange keys safely and efficiently be...

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Problems solved by technology

[0004] At present, domestic and foreign researchers have proposed solutions to the above problems, including forward secure cryptosystem, key isolation, secret sharing, intrusion rebound, etc., but none of these solutions fully solve the key leakage problem of side channel attacks; In addition, there are various means and methods of side-channel attacks. Most of the traditional methods can only be protected against specific existing types of attacks. For new attack methods, only after-the-fact countermeasures can be taken. Therefore, there is a broad definition of building keys The general theoretical model that the system and keys still maintain security when there is a limited leak in the attack has become one of the important problems in modern cryptography to solve the leak problem. It is of great theoretical and practical significance to study and design an anti-leakage cryptographic scheme.

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