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3.2.7 Replay Resistance

NIST PIV and digital identity SP 800-63B-4 against SP 800-63B
All changes in this version
added 3 Authenticator and Verifier Requirements part of 3.2

Title changed

Before · SP 800-63B

After · SP 800-63B-4

Replay Resistance

Control changed

Before · SP 800-63B

After · SP 800-63B-4

An authentication process resists replay attacks if it is impractical to achieve a successful authentication by recording and replaying a previous authentication message. Replay resistance is in addition to the replay-resistant nature of authenticated protected channel protocols since the output could be stolen before entry into the protected channel. Protocols that use nonces or challenges to prove the “freshness” of the transaction are resistant to replay attacks since the verifier will easily detect when old protocol messages are replayed because they will not contain the appropriate nonces or timeliness data. Examples of replay-resistant authenticators include OTP authenticators, cryptographic authenticators, and look-up secrets.

In contrast, passwords are not considered replay-resistant because the same authenticator output (i.e., the password itself) is provided for each authentication.