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计算机工程

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简化轮LBlock的密钥中比特检测及分析

莫 钊,韦永壮   

  1. (桂林电子科技大学广西信息科学实验中心,广西 桂林 541004)
  • 收稿日期:2013-06-05 出版日期:2014-03-15 发布日期:2014-03-13
  • 作者简介:莫 钊(1987-),男,硕士研究生,主研方向:分组密码分析;韦永壮,教授、博士。
  • 基金资助:

    国家自然科学基金资助项目(61100185);广西自然科学基金青年基金资助项目(2011GXNSFB018071);广西无线宽带通信与信号处理重点实验室(桂林电子科技大学)主任基金资助项目(11101)。

Detection and Analysis of Key Neutral-bit for Reduced Round LBlock

MO Zhao, WEI Yong-zhuang   

  1. (Guangxi Experiment Center of Information Science, Guilin University of Electronic Technology, Guilin 541004, China)
  • Received:2013-06-05 Online:2014-03-15 Published:2014-03-13

摘要:

LBlock密码算法是近来提出的一类轻量级分组加密算法。利用LBlock算法的结构特点,结合立方检测的基本思想,设计2个密钥中比特捕获算法,对LBlock算法输出所涉及的密钥比特个数情况进行分析。9轮简化LBlock的每个输出比特全部卷入所有的主密钥比特信息,在18维立方变元下,11轮简化LBlock的输出累加中每个比特全部卷入所有的主密钥比特信息。上述2轮简化LBlock均不存在密钥中比特。研究结果表明,全轮LBlock密码算法具有稳固的密钥信息扩散及混淆性,足以抵抗经典立方攻击。

关键词: 轻量级密码, 分组密码, 密钥中比特, 立方测试, S盒, LBlock密码

Abstract:

Recently, LBlock as a new lightweight block cipher is presented. By using both the structure of LBlock algorithm and the basic idea from the cube test, two neutral-bit detection algorithms are proposed. It is shown that all master key bits are involved in the each output of 9-round reduced LBlock cipher. Moreover, for given 18 cube variables, there still is nonexistence of key neutral-bit for 11-round reduced LBlock cipher. Research result shows that the full-round LBlock cipher has good key bits confusion against the classical cube attacks.

Key words: lightweight cipher, block cipher, key neutral-bit, cube test, S box, LBlock cipher

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