密码技术主要包括对称密码算法和非对称密码算法及协议。
It mainly includes symmetric encryption algorithms and asymmetric cryptographic algorithms and protocols.
将对称密码算法和非对称密码算法共同使用，增强了应用系统的安全性。
Using the symmetric algorithms and the asymmetric algorithms together security performance of the application system is improved.
首先阐述密码学的相关概念，然后对传统密码技术和现代的对称密码算法与非对称密码算法及其安全性进行分析；
Related conception is introduced at first, then the principle and security of conventional cryptology, modern symmetrical encryption algorithms and asymmetrical encryption algorithms are analysed;
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