SESSION KEY NEGOTIATION METHOD, DEVICE, AND SYSTEM

摘要

Embodiments of the present invention provide a session key negotiation method, apparatus, and system. The session key negotiation method in the present invention includes: obtaining, by first user equipment, a vector à B according to a long-term private key s B and a temporary private key y B that correspond to the first user equipment, and a received long-term public key P A and a received temporary public key x A that correspond to second user equipment performing session negotiation with the first user equipment; calculating and obtaining v B according to the vector à B by using a formula v B = dbl ( à B ) ; obtaining a semaphore v B according to v B by using a formula v B =Œ© v B Œª 2 ; and calculating and obtaining a session key K according to v B by using a formula K = v €¾ B 2 = 2 q €¢ v €¾ B , where q is an even number and is not equal to 2.