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A New SHA-1 System to Resist Modular Differential Attack
Author(s): GAO Xiao-dong1, 2 LIUNian2 LI Zi-chen2 1.Communication Engineering Institute, Xidian University, Xi’an Shanxi 710071, China 2.Beijing Electronic Science and Technology Institute, Beijing 100070, China
Pages: 43-
49
Year: 2012
Issue:
2
Journal: Beijing Electronics
Keyword: SHA-1; 消息修改; 模减差分; 局部碰撞;
Abstract: 消息修改技术和模减差分攻击方法对SHA-1构成严重安全性威胁。基于SHA-1存在无法抵抗模减差分攻击的安全性缺陷,提出一种对SHA-1的改进算法。该算法有效地增加了运用消息修改技术的困难,并且得到良好的差分扩散特性。由于改进Hash算法只改动了步函数,仅增加了一个加法和循环移位,没有改变信息填充方式和消息摘要长度,容易实现原有基于SHA-1的软硬件产品的升级。经证明并通过算法实现,得出改进SHA-1与标准SHA-1的效率相当。
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