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<title>Oracle attack</title>

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<p>In the field of <a href="Security_engineering" title="Security engineering">security engineering</a>, an <b>oracle attack</b> is an attack that exploits the availability of a weakness in a system that can be used as an "<a href="Test_oracle" title="Test oracle">oracle</a>" to give a simple go/no go indication to inform attackers how close they are to their goals. The attacker can then combine the oracle with a systematic search of the problem space to complete their attack.<sup id="cite_ref-1" class="reference"><a href="#cite_note-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup>

</p><p>The <a href="Padding_oracle_attack" title="Padding oracle attack">padding oracle attack</a>, and compression oracle attacks such as <a href="BREACH" title="BREACH">BREACH</a>, are examples of oracle attacks, as was the practice of "crib-dragging" in the <a href="Cryptanalysis" title="Cryptanalysis">cryptanalysis</a> of the <a href="Enigma_machine" title="Enigma machine">Enigma machine</a>. 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.

</p><p>In a <b>compression oracle attack</b> the use of adaptive <a href="Data_compression" title="Data compression">data compression</a> on a mixture of <a href="Chosen_plaintext" class="mw-redirect" title="Chosen plaintext">chosen plaintext</a> and unknown plaintext can result in content-sensitive changes in the length of the compressed text that can be detected even though the content of the compressed text itself is then encrypted. This can be used in protocol attacks to detect when the injected known plaintext is even partially similar to the unknown content of a secret part of the message, greatly reducing the complexity of a search for a match for the secret text. The <a href="CRIME" title="CRIME">CRIME</a> and <a href="BREACH_(security_exploit)" class="mw-redirect" title="BREACH (security exploit)">BREACH</a> attacks are examples of protocol attacks using this phenomenon.

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<ul><li><a href="Side-channel_attack" title="Side-channel attack">Side-channel attack</a></li></ul>

<div class="mw-heading mw-heading2"><h2 id="References">References</h2></div>

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</style><cite id="CITEREFJason_Coombs2004" class="citation web cs1">Jason Coombs (2 December 2004). <a rel="nofollow" class="external text" href="http://www.drdobbs.com/understanding-oracle-attacks-on-informat/184405917">"Understanding Oracle Attacks"</a>. Dr. Dobbs'<span class="reference-accessdate">. Retrieved <span class="nowrap">2013-10-04</span></span>.</cite></span>

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This article is issued from <a class="external text" title="Last edited on 2024-12-25" href="https://en.wikipedia.org/wiki/?title=Oracle_attack&oldid=1265084009">Wikipedia</a>. The text is available under <a class="external text" href="https://creativecommons.org/licenses/by-sa/4.0/deed.en">Creative Commons Attribution-Share Alike 4.0</a> unless otherwise noted. Additional terms may apply for the media files.

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