带延迟的分组密码算法密钥结合模式设计

A Key Delay Design on Block Cipher Algorithm

提出了一种分组密码算法的延迟结合模式,进行了基于信息论原则的安全性证明,并对加入延迟后的密钥执行效率进行了评估。对于算法公开的分组密码,使用密钥延迟技术加强密码体制本身的强度,弱化种子密钥通过互联网公开分发造成的信息泄漏,特别可以有效阻止中间人唯密文进行的算法还原攻击。

A key delay design on block cipher is proposed and is demonstrated based on provable security with information theory. Furthermore, we evaluate the result of key delay module. For the published block cipher, the key delay technology can enforce the cryptography system and decrease the information leak from key distribution through internet. Especially, this model can prevent the only cipher-text attack by middle attack.