Patent ID: 8095792
Filing Date: 2012-01-10
Classification: H04L

Abstract:
1. A method performed by one correspondent in a data communication system for confirming the originality and authenticity of messages generated by other correspondents in the data communication system, the method comprising: a cryptographic processor at the one correspondent obtaining a signed message, said signed message comprising information and a signature signing said information, from another correspondent in the data communication system via a communication link, wherein said information was generated by said other correspondent, and wherein a first component of the signature comprises random data generated by said other correspondent and a second component of the signature comprises a calculated value generated from the information and the random data in accordance with a particular cryptographic protocol; said cryptographic processor verifying said signature to authenticate said signed message, wherein said verifying utilizes said random data and said information; said cryptographic processor extracting from said signature, a bit pattern representative of said random data and comparing said bit pattern to one or more previously extracted bit patterns stored in a memory of the correspondent, said previously extracted bit patterns previously received with signed messages received from said other correspondent; and, said cryptographic processor confirming said originality and said authenticity of said signed message if said signature is verified and said extracted bit pattern is not matched to said previously extracted bit patterns.