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Nonlinear Cryptanalysis of 5-Round SAFER++
Author(s): WU Wenling, MA Hengtai, TANG Liuying, QING Sihan
Pages: 961-
965
Year: 2003
Issue:
7
Journal: ACTA ELECTRONICA SINICA
Keyword: 线性密码分析; 非线性密码分析; 线性逼近; 非线性逼近; SAFER++;
Abstract: SAFER+ +是进入NESSIE第二轮评估的7个算法之一.设计者称2.5轮SAFER+ +可以抵抗线性密码分析.J Nakahara指出对某些密钥,改进型线性密码分析攻击4轮SAFER+ +比强力攻击有效.本文对SAFER+ +的基础模块深入分析和测试后,对5轮SAFER+ +进行非线性密码分析;攻击对2252个256比特长度的密钥有效,攻击的数据复杂度为2120.虽然此攻击对SAFER+ +的实际安全构不成威胁,但是显示非线性密码分析攻击5轮SAFER+ +比强力攻击有效,也说明了非线性密码分析攻击5轮SAFER+ +比线性密码分析和J Nakahara等的改进型线性密码分析有效.
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