Related-Key Differential Attacks on Cobra-H64/128

LUO Wei; GUO Jian-sheng

doi:10.3969/j.issn.0372-2112.2013.08.018

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Related-Key Differential Attacks on Cobra-H64/128

更新时间：2025-07-16

- Related-Key Differential Attacks on Cobra-H64/128
- Acta Electronica Sinica Vol. 41, Issue 8, Pages: 1569-1573(2013)
- 作者机构：
  
  解放军信息工程大学,河南,郑州,450004
- 作者简介：
- 基金信息：
- DOI：10.3969/j.issn.0372-2112.2013.08.018
  CLC： TN918.1
- Published：2013
- 稿件说明：
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LUO Wei, GUO Jian-sheng. Related-Key Differential Attacks on Cobra-H64/128[J]. Acta Electronica Sinica, 2013, 41(8): 1569-1573.
DOI：

LUO Wei, GUO Jian-sheng. Related-Key Differential Attacks on Cobra-H64/128[J]. Acta Electronica Sinica, 2013, 41(8): 1569-1573. DOI： 10.3969/j.issn.0372-2112.2013.08.018.

摘要

本文研究了Cobra-H64/128分组密码算法在相关密钥-差分攻击下的安全性.针对Cobra-H64算法

利用新构造的相关密钥-差分路径和CP逆变换存在的信息泄露规律给出攻击算法1

恢复出了全部128bit密钥

相应的计算复杂度为2^40.5次Cobra-H64算法加密

数据复杂度为2^40.5个选择明文

存储复杂度为2^22bit

成功率约为1;针对Cobra-H128算法

利用新构造的相关密钥-差分路径给出攻击算法2

恢复出了全部256bit密钥

相应的计算复杂度为2^76次Cobra-H128算法加密

数据复杂度为2^76个选择明文

存储复杂度为2^16.2bit.分析结果表明

Cobra-H64/128算法在相关密钥-差分攻击条件下是不安全的.

Abstract

The security of Cobra-H64/128 block cipher under related-key differential cryptanalysis was studied.For Cobra-H64

we use related-key differential attack to get the whole 128 bits key with probability 1 based on the new constructed related-key differential and loopholes in CP box

and the corresponding computational complexity is 2^40.5 Cobra-H64 encryptions

the data complexity is 2^40.5 chosen-plaintexts

the memory complexity is 2^22 bits.To recover the whole 256 bits key of Cobra-H128

we need a computational complexity of 2^76 Cobra-H128 encryptions

a data complexity of 2^76 chosen-plaintexts

a memory complexity of 2^16.2 bits.The analysis results show that Cobra-H64/128 are unsafe under related-key differential attacks.

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Related Institution

Science and Technology on Information Assurance Laboratory

The Unit of 78179

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School of Communication and Information EngineeringShanghai UniversityShanghai 200072China

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