Method for establishing safety communication of network groups

Abstract

The invention discloses a method for establishing safety communication of network groups. The method comprises the following steps of: processing long-term secret data and authentication information of group communication members by using an SHA (Secure Hash Algorithm) safety hash function which is 512 bits in length; and distributing a key by using an interpolation polynomial according to a secret partition threshold scheme of Shamir to keep a group key fresh, confidential and authenticable and effectively resist external attacks and internal attacks. According to the invention, all information is transmitted on a public channel, so that the method has the characteristics of low calculation amount, high running speed and high server calculation efficiency.

Description

technical field [0001] The invention relates to the field of information security, in particular to a method for establishing secure communication of a social network group. Background technique [0002] At present, the group communication system is becoming an important form of communication, that is, multiple members in the same communication group can exchange information together. Typical group communication applications include online games, distributed computing, video and audio conferences, and network communication. community etc. Due to the openness of the network, the security of group communication is very important, so confidential communication is required. When users conduct confidential communication, they must first have a shared secret key, and in order to prevent attackers from obtaining the key, they must always Renewal keys, therefore, the strength of a cryptosystem relies on key distribution techniques. The establishment of a secure multi-party channel...

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Problems solved by technology

[0003] In the existing technology, the key transmission method relies on a trusted key generation center (KGC for short) to select the session key and transmit the session key to the communication parties. The key generation center KGC uses a The key is used to encrypt the session key. Every time a session is initiated, the session key needs to be updated once. Therefore, the group communication process is like this. When multiple users simultaneously request to establish group communication, KGC will be continuously calculated, updated and stored. A large number of keys and data, and all information is transmitted on a secure channel, which reduces efficiency

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