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 σ_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 σ_B by using a formula v_B=dbl(σ_B); obtaining a semaphore v_B according to v_B by using a formula v_B=〈v_B〉₂; and calculating and obtaining a session key K according to v_B by using a formula $K={\left[{\bar{v}}_B\right]}_2=\left[\frac{2}{q}•{\bar{v}}_B\right],\mathop{\mathrm{image}}$ where q is an even number and is not equal to 2.