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Replay attack
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==Example== [[File:Replay attack on hash.svg|thumb|300px|Illustration of a replay attack. Alice (A) sends her hashed password to Bob (B). Eve (E) sniffs the hash and replays it.]] Suppose [[characters in cryptography|Alice]] wants to prove her identity to Bob. Bob requests her password as proof of identity, which Alice dutifully provides (possibly after some transformation like [[hash function|hashing]], or even [[Salt (cryptography)|salting]], the password); meanwhile, Eve is eavesdropping on the conversation and keeps the password (or the hash). After the interchange is over, Eve (acting as Alice) connects to Bob; when asked for proof of identity, Eve sends Alice's password (or hash) read from the last session which Bob accepts, thus granting Eve access.<ref name=":0" />
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