Split-key key-agreement protocol

Details Split-key key-agreement protocol Split-key key-agreement protocol

H - Electricity

04

L

H04L 9/30 (2006.01)

Patent

CA 2277633

This invention relates to a method for generating a shared secret value between entities (E) in a data communication system, one or more of the entities having a plurality of members (M ij) for participation in the communication system, each member having a long term private key (P rij) and a corresponding long term public key (P Uij). The method comprises the steps of generating a short term private (x ij) and a corresponding short term public key (X ij)for each of the members (M ij); exchanging short term public keys (X ij) of the members within an entity (i). For each member then computing an intra-entity shared key by mathematically combining the short term public keys (X ij) of each the members computing an intra-entity public key (s i) by mathematically combining its short-term private key (x ij), the long term private key (P rij) and the intra-entity shared key. Next for each entity combining intra-entity public keys (s i) to derive a group short-term Si public key; each entity transmitting its intra-entity shared key (X i) and its group short term public (S i) key to the other entities; and each entity computing a common shared key K by combining its group short term public key (S i), with the intra-entity shared key (~i), and a group short term public (~i) key received from the other entities.

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