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+<a href="Documentation.html">Documentation</a>
+<img src="arrow_right.gif" alt=">>" style="margin-top: 5px">
+<a href="Encryption%20Algorithms.html">Encryption Algorithms</a>
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+<a href="Serpent.html">Serpent</a>
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+<h1>Serpent</h1>
+<div style="text-align:left; margin-top:19px; margin-bottom:19px; padding-top:0px; padding-bottom:0px">
+<p>Designed by Ross Anderson, Eli Biham, and Lars Knudsen; published in 1998. It uses a 256-bit key, 128-bit block, and operates in XTS mode (see the section
+<a href="Modes%20of%20Operation.html"><em>Modes of Operation</em></a>). Serpent was one of the AES finalists. It was not selected as the proposed AES algorithm even though it appeared to have a higher security margin
+ than the winning Rijndael [4]. More concretely, Serpent appeared to have a <em>high</em> security margin, while Rijndael appeared to have only an
+<em>adequate</em> security margin [4]. Rijndael has also received some criticism suggesting that its mathematical structure might lead to attacks in the future [4].<br>
+<br>
+In [5], the Twofish team presents a table of safety factors for the AES finalists. Safety factor is defined as: number of rounds of the full cipher divided by the largest number of rounds that has been broken. Hence, a broken cipher has the lowest safety factor
+ 1. Serpent had the highest safety factor of the AES finalists: 3.56 (for all supported key sizes). Rijndael-256 had a safety factor of 1.56.<br>
+<br>
+In spite of these facts, Rijndael was considered an appropriate selection for the AES for its combination of security, performance, efficiency, implementability, and flexibility [4]. At the last AES Candidate Conference, Rijndael got 86 votes, Serpent got 59
+ votes, Twofish got 31 votes, RC6 got 23 votes, and MARS got 13 votes [18, 19].*</p>
+<p>* These are positive votes. If negative votes are subtracted from the positive votes, the following results are obtained: Rijndael: 76 votes, Serpent: 52 votes, Twofish: 10 votes, RC6: -14 votes, MARS: -70 votes [19].</p>
+<p>&nbsp;</p>
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