Greatest Common Divisor is one of the basic subjects in computational number theory, it has a wide application in encryption and analysis of cryptography.
最大公因子计算是计算数论的基础课题之一，它在密码算法和密码分析中有着非常广泛的应用。
In some detail, the paper expounds the principle about simple power analysis (SPA) attacks against the general cryptography and a particular theory against data encryption standard (DES) algorithm.
详细地阐述了对通用密码系统实施简易功耗分析攻击(SPA)的理论基础和对DES算法攻击的特定理论，并提出了对SPA的改进算法。
The analysis of security for the cryptography demonstrates the cryptography can resist the message replay attacks and man in the middle attacks, and is feasible in practice.
对该密码安全体制进行安全分析后表明：该体制能有效地抵御网络中的消息重放攻击和中间人攻击，并在实际应用中有较高的可行性。
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