Patent ID: 8069346
Filing Date: 2011-11-29
Classification: G06F,H04L

Abstract:
1. A method of conjointly computing a cryptographic key and including a component in said cryptographic key for authenticating said cryptographic key, said cryptographic key to be shared between a pair of correspondents communicating with one another through a cryptographic system, one of said correspondents receiving a certificate of the other correspondent's public key information to be combined with private key information of the one correspondent to generate said cryptographic key, said method performed by a computing device, said method comprising the steps of computing said cryptographic key by combining said public key information and said private key information and including in said cryptographic key said component corresponding to verification of said certificate, such that failure of said certificate to verify results in a key at said one correspondent that is different to the key computed at said other correspondent, wherein: said verification utilises a signature contained in said certificate; and said component equates to a predetermined value when said certificate verifies.