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Oracle attack
In the field of security engineering, an oracle attack is an attack that exploits the availability of a weakness in the system which can be used as an "oracle" which can give a simple go/no go indication to show whether the attacker has reached, or is nearing, their goal. The attacker can then combine the oracle with systematic search of the problem space to complete their attack.
The padding oracle attack, and compression oracle attacks such as BREACH, are examples of oracle attacks, as was the practice of "crib-dragging" in the cryptanalysis of the Enigma machine. An oracle need not be 100% accurate: even a small statistical correlation with the correct go/no go result can frequently be enough for a systematic automated attack.
== See also ==
* Side-channel attack
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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