Session key negotiating method, system and server in communication network

Abstract

The invention discloses a key agreement method, a system and a server of a communication network, the method comprises the following steps: a first terminal sends a conversation key ciphertext which is generated after the encryption of a conversion key by an encryption key of a key agreement server to the key agreement server; the key agreement server obtains the conversation key from the decryption of the conversation key ciphertext, the encryption key of a second terminal re-encrypts to the conversation key for generating the conversation key ciphertext to be sent to the second terminal; and the second terminal obtains the conversation key from the decryption of the obtained conversation key ciphertext and returns a response message to the first terminal. The conversation key agreement method and the system provided by the invention realize the simple process and ensure the safety of the key transmission through the realization of the encryption transmission of the conversation key by the key agreement server. The key agreement is realized by the use of the non-symmetric cryptosystem, and the encryption communication is realized by using the symmetric cryptosystem, thereby fully utilizing the advantages of the symmetric and the non-symmetric cryptosystems.

Description

technical field [0001] The invention relates to network information security technology, in particular to a session key negotiation method, system and server in a communication network. Background technique [0002] In various communication systems, how to realize the protection of interactive information between users and ensure the security and confidentiality of communication content is a key consideration. Especially in the mobile communication system, there is a process of air transmission for the interactive information, and the requirement for the security of the information is particularly prominent. Encrypting the transmitted data is an important way to realize secure communication. The current encryption system includes symmetric key system and asymmetric key system. Compared with the asymmetric key system, the symmetric key system has higher computational complexity, and the security strength of the symmetric key system is also high, so the symmetric key system ...

AI Technical Summary

Problems solved by technology

However, in the communication system, due to the control of the network on the user, the two parties in the communication cannot directly negotiate the key under normal circumstances. Therefore, it is necessary to provide an implementation of the session key agreement suitable for the communication network

Images