Key negotiation method and device based on preset key group, and communication system

• Main Authors: GAO ZHAO, XU HAIXIN, ZHANG LIDA, YANG YONG, YIN TAO, HUANG CAN, WU JIE, WU YUN, ZHANG XIN, ZHANG XUNCHEN, YANG YANG, LUO YONGFU, LI LEI
• Format: Patent
• Language: Chinese; English
• Published: 16.05.2023
• Subjects: ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHICCOMMUNICATION

The invention discloses a key negotiation method and device based on a preset key group and a communication system, and belongs to the field of information security. Comprising the following steps: two key negotiation parties exchange through a DH, generate a session key component, generate a final session key in combination with PSK, perform encryption and decryption operation by using the session key in a communication process, delete a session after communication is completed, and clear a used preset key by the two key negotiation parties. According to the method, a conventional key exchange protocol and preset key components are combined to carry out key negotiation, a transmission session encryption key is obtained, different preset key components PSK need to be used in each session, the PSK is deleted after being used up, 'one session and one key 'is ensured, the forward security is better improved, the method has good anti-attack performance, and the method is suitable for large-scale popularization an