Stream cipher and block cipher are main cipher systems in image encryption algorithm based on bit operation.
流密码与分组密码是基于位运算的图像加密算法中两种主要密码体制。
The k error linear complexity of periodic sequences is one of the important security indices of stream cipher systems.
公钥密码系统以其算法设计简单、安全性高已经成为密码学领域的一个非常重要的研究课题。
A novel block cipher based on chaotic systems is presented.
提出了一种新的基于混沌的分组密码算法。
The technology of transposition cipher is discussed firstly and a novel dynamic transposition cipher based on chaotic systems is presented.
在对换位加密技术研究的基础上，提出了一个基于混沌系统的动态换位加密方案。
Electronic certification service systems shall be built by entities qualified for producing cipher code products for commercial uses.
电子认证服务系统应当由具有商用密码产品生产资质的单位承建。
Therefore, we can use this to build up a cipher text communication pipe for data transferring between clients and servers of database systems to preserve data confidentiality and integrity.
因而可以在客户端与服务器之间构建一条透明的安全通道，从而保证网络传输过程中数据的保密性和完整性。
Chaotic systems are sensitive to the initial condition, randomness and correlativity. They can produce good pseudo - stochastic sequences. Therefore, these systems are suitable to the stream cipher.
而混沌系统具有对初始条件敏感性、随机性、相关性等优良的密码学性能，能够产生性能良好的伪随机序列，所以很适合于序列加密。
Chaotic systems are sensitive to the initial condition, randomness and correlativity. They can produce good pseudo - stochastic sequences. Therefore, these systems are suitable to the stream cipher.
而混沌系统具有对初始条件敏感性、随机性、相关性等优良的密码学性能，能够产生性能良好的伪随机序列，所以很适合于序列加密。
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