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Serpent - 版本历史
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<p><b>新页面</b></p><div>{{NoteTA<br />
|G1=IT<br />
}}<br />
{{Infobox encryption method<br />
|name = Serpent<br />
|image = [[File:Serpent-linearfunction.svg|200px|center]]<br />
|caption = Serpent的线性混合阶段<br />
|designers = {{link-en|羅斯·安德森|Ross J. Anderson}}、{{link-en|艾力·畢漢姆|Eli Biham}}、{{link-en|拉爾斯·克努森|Lars Knudsen}}<br />
|publish date = {{sda|1998|08|21}}<br />
|series = <br />
|derived from = {{le|Square (密码)|Square (cipher)|Square}}<br />
|derived to = <br />
|related to = <br />
|certification = [[AES决赛算法]]<br />
|digest size = <!--(hash functions)--><br />
|key size = 128、192、256位<br />
|security claim = <br />
|block size = 128位<br />
|state size = <!--(stream ciphers)--><br />
|structure = <br />
|rounds = 32<br />
|speed = <br />
|cryptanalysis = <br />
All publicly known attacks are computationally infeasible, and none of them affect the full 32-round Serpent. A 2011 attack breaks 11 round Serpent (all key sizes) with 2<sup>116</sup> known plaintexts, 2<sup>107.5</sup> time and 2<sup>104</sup> memory (as described in <ref name=acisp-2011>{{cite journal<br />
|title = Improving the Algorithm 2 in Multidimensional Linear Cryptanalysis<br />
|author1 = Huaxiong Wang, Hongjun Wu<br />
|author2 = Phuong Ha Nguyen<br />
|lastauthoramp = yes<br />
|year = 2011<br />
|publisher = ACISP 2011<br />
|url = http://www3.ntu.edu.sg/home/wuhj/research/publications/2011_ACISP_MLC.pdf<br />
|doi = 10.1007/978-3-642-22497-3_5<br />
|journal = <br />
|access-date = 2018-10-24<br />
|archive-date = 2017-04-14<br />
|archive-url = https://web.archive.org/web/20170414133320/http://www3.ntu.edu.sg/home/wuhj/research/publications/2011_ACISP_MLC.pdf<br />
|dead-url = no<br />
}}</ref>).<br />
<br />
The same paper also describes two attacks which break 12 rounds of Serpent-256. The first requires 2<sup>118</sup> known plaintexts, 2<sup>228.8</sup> time and 2<sup>228</sup> memory. The other attack requires 2<sup>116</sup> known plaintexts and 2<sup>121</sup> memory but also requires 2<sup>237.5</sup> time.<br />
}}<br />
'''Serpent'''是一種[[對稱密鑰加密|對稱式]][[分組加密]]演算法，是[[高级加密标准]]（AES）的候選者之一，其順序僅次於[[Rijndael]]演算法。設計者為{{link-en|羅斯·安德森|Ross J. Anderson}}、{{link-en|艾力·畢漢姆|Eli Biham}}及{{link-en|拉爾斯·克努森|Lars Knudsen}}。<br />
<br />
与其他進入AES評選名單的演算法一樣，Serpent的區塊長度為128[[位元]]，支援的密鑰長度為128、192和256位元。<br />
<br />
==参考文献==<br />
{{reflist}}<br />
<br />
==外部連結==<br />
* [http://embeddedsw.net/Cipher_Reference_Home.html 256bit Ciphers]{{Wayback|url=http://embeddedsw.net/Cipher_Reference_Home.html |date=20110926210349 }} - SERPENT參考實作程式<br />
<br />
{{分组密码}}<br />
{{Crypto-stub}}<br />
[[Category:分组密码]]<br />
[[Category:自由软件]]<br />
[[Category:免费密码]]</div>
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