Abstract: Challenge-response can be a secure way of protecting access to any privileged material if implemented correctly. In this document, many options for challenge-response access control are discussed but the most secure method given is presenting a different random challenge on each access attempt and having a response that only the host can interpret without giving out any secrets. This document shows why Dallas Semiconductor/Maxim’s SHA-1 iButtons® and 1-Wire® devices are ideal choices when implementing this kind of challenge-response system.
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