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计算机工程 ›› 2008, Vol. 34 ›› Issue (20): 146-148. doi: 10.3969/j.issn.1000-3428.2008.20.053

• 安全技术 • 上一篇    下一篇

基于字的流密码Dragon的分析

李 媛,仵丽花,胡予濮   

  1. (西安电子科技大学计算机网络与信息安全教育部重点实验室,西安 710071)
  • 收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2008-10-20 发布日期:2008-10-20

Cryptanalysis of Word Based Stream Cipher Dragon

LI Yuan, WU Li-hua, HU Yu-pu   

  1. (Key Lab of Computer Network and Information Security, Ministry of Education, Xidian University, Xi’an 710071)
  • Received:1900-01-01 Revised:1900-01-01 Online:2008-10-20 Published:2008-10-20

摘要: 研究一种新型的流密码——Dragon。Dragon使用了非线性反馈移位寄存器(NLFSR)和S盒,密钥长度是可变的128 bit或256 bit。探讨了Dragon的设计原理,从内部结构角度分析讨论其安全性,指出Dragon对暴力攻击和TMD攻击是安全的,同时构造了Dragon的线性逼近式,给算法提了2点建议。

关键词: 流密码, 线性分析, Dragon算法

Abstract: This paper studies a new tube stream cipher, Dragon. Dragon uses non-linear feedback shift registers and S boxes. It operates on key sizes of 128 bit and 256 bit. Its mechanism, performance and design principles are studied, and the security against the well-known cryptanalysis is discussed. It is pointed out that Dragon is secure against the brute and TMD attack and also the linear approximations are presented. Some suggestions for Dragon are proposed.

Key words: stream ciphers, linear analysis, Dragon algorithm

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