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SIMON类非线性函数的线性性质研究

关杰 卢健伟

关杰, 卢健伟. SIMON类非线性函数的线性性质研究[J]. 电子与信息学报, 2021, 43(11): 3359-3366. doi: 10.11999/JEIT200999
引用本文: 关杰, 卢健伟. SIMON类非线性函数的线性性质研究[J]. 电子与信息学报, 2021, 43(11): 3359-3366. doi: 10.11999/JEIT200999
Jie GUAN, Jianwei LU. Research on Linear Properties of SIMON Class Nonlinear Function[J]. Journal of Electronics & Information Technology, 2021, 43(11): 3359-3366. doi: 10.11999/JEIT200999
Citation: Jie GUAN, Jianwei LU. Research on Linear Properties of SIMON Class Nonlinear Function[J]. Journal of Electronics & Information Technology, 2021, 43(11): 3359-3366. doi: 10.11999/JEIT200999

SIMON类非线性函数的线性性质研究

doi: 10.11999/JEIT200999
基金项目: 国家自然科学基金(61572516)
详细信息
    作者简介:

    关杰:女,1974年生,教授,博士生导师,研究方向为密码理论和密码算法分析

    卢健伟:男,1997年生,硕士生,研究方向为对称密码设计与分析

    通讯作者:

    卢健伟 lujianwei1997@163.com

  • 中图分类号: TN918.1

Research on Linear Properties of SIMON Class Nonlinear Function

Funds: The National Natural Science Foundation of China (61572516)
  • 摘要: SIMON算法是由美国国家安全局(NSA)在2013 年推出的一簇轻量级分组密码算法,具有实现代价低、安全性能好等优点,其轮函数采用了$F(x) = (x < < < a){{\& }}(x < < < b) \oplus (x < < < c)$类型的非线性函数。该文研究了移位参数(a,b,c)一般化时SIMON类算法轮函数的线性性质,解决了这类非线性函数的Walsh谱分布规律问题,证明了其相关优势只可能取到${{0}}$${2^{ - k}}$,其中$k \in Z$${{0}} \le k \le \left\lfloor {{2^{ - 1}}n} \right\rfloor $,并且对于特定条件下的每一个$k$,都存在相应的掩码对使得相关优势等于${2^{ - k}}$,给出了相关优势取到${2^{ - 1}}$时的充分必要条件及掩码对的计数,给出了特定条件下非平凡相关优势取到最小值时的充分必要条件与掩码对的计数。
  • 表  1  ${F_{abc}}(x)$相关优势计数表

    $ \left| \rho \right|$
    011/21/41/81/161/32
    $F_{182}^8$482551641280825676800
    $F_{051}^8$482551641280825676800
    $F_{182}^9$207863172172815360371200
    $F_{051}^9$207863172172815360371200
    下载: 导出CSV

    表  2  转变成不相交2次型算法(算法1)

     输入:2次型布尔函数$f\left( x \right) = f\left( {{x_1},{x_2}, \cdots ,{x_n}} \right)$
     输出:可逆矩阵${\boldsymbol{M}}$,不相交二次型$\hat f\left( x \right)$使得$\hat f\left( x \right){\rm{ = }}f\left( {x{\boldsymbol{M}}} \right)$
     (1) /*初始化*/
     (2) ${\boldsymbol{M}} \leftarrow {\boldsymbol{I}}$          /*${\boldsymbol{I}}$是$n \times n$的可逆矩阵*/
     (3) $\hat f\left( x \right) \leftarrow f\left( {{x_1},{x_2}, \cdots ,{x_n}} \right)$
     (4) $v \leftarrow {\rm{PickIndex} }\left( {\hat f} \right)$
     (5) /*不相交化*/
     (6) 当$\sigma \left( {\hat f,{x_v}} \right) \ge 2$时,执行
     (7)  $m \leftarrow \sigma \left( {\hat f,{x_v}} \right)$   /*$\hat f$中包含${x_v}$的2次项个数*/
     (8)  在$\hat f$中找出所有的2次项${x_v}{x_{{t_i}}}$满足${t_1} < {t_2} < \cdots < {t_m}$
     (9)  $\hat f \leftarrow {\rm{Substitute}}\left( {\hat f,{{\boldsymbol{I}}_{{t_1} \leftarrow {t_1},{t_2}, \cdots ,{t_m}}}} \right)$
     (10)  ${\boldsymbol{M}} \leftarrow {{\boldsymbol{I}}_{{t_1} \leftarrow {t_1},{t_2}, \cdots ,{t_m}}} \cdot {\boldsymbol{M}}$
     (11)  如果$\sigma \left( {\hat f,{x_{{t_1}}}} \right) \ge 2$,执行
     (12)   $k \leftarrow \sigma \left( {\hat f,{x_{{t_1}}}} \right)$
     (13)   在$\hat f$中找出所有的2次项${x_{{t_1}}}{x_{{s_i}}}$满足
          ${s_1} < {s_2} < \cdots < {s_m}$,
    下载: 导出CSV
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    DONG Xiangzhong, GUAN Jie. Analysis on difffferential properties of the round function of SIMON family of block ciphers[J]. Journal of Cryptologic Research, 2015, 2(3): 207–216. doi: 10.13868/j.cnki.jcr.000072
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出版历程
  • 收稿日期:  2020-11-25
  • 修回日期:  2021-03-30
  • 网络出版日期:  2021-05-06
  • 刊出日期:  2021-11-23

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