Replay Attack

Updated 31 Jul 2026

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def
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  capturing legitimate data (e.g., authentication information) and replaying it later to impersonate someone, without ever needing to know the actual password or key
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related techniques
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  Pass the Hash
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  Session Hijacking
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mitigation
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  encrypt sensitive data in transit; use session tokens/timestamps so captured data can't simply be reused later
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related
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  On-path Attack
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cards
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  What is a replay attack?
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    Capturing legitimate authentication data and reusing it later to impersonate someone, without ever knowing the actual password or key

Linked references 4