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2020/106 (PDF) Last updated: 2020-02-04
Relaxed freshness in component authentication
Frank Schuhmacher
Foundations

We suggests a relaxed freshness paradigm for challenge-response authentication for each field of application where challenger and responder are tightly coupled and authentication takes place in a friendly environment. Replay attacks are not feasible under this premise, and freshness can be relaxed to relative freshness: no refresh is required as long as all previously tested responders were authentic. One field of application is anti-counterfeiting of electronic device components. The main...

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