Any good cryptographic hashing algorithm should make finding a duplicate hash for an alternative plaintext difficult, even given a known message and its associated message hash.
任何好的密码杂凑演算法应该是这样的，即使给定一个已知的讯息和与它关联的讯息杂凑，也很难找到替代明码的迭代杂凑。
For the design of a compression function one can either start from scratch and build a function specific for the purpose of hashing or use existing cryptographic building blocks such as block ciphers.
通常设计压缩函数有两种方法：一、利用某些数学工具专为哈希目的而设计一个压缩函数，二、利用现有的密码算法如分组密码来作为压缩函数等。
This property identifies all cryptographic functions involved in creating an XML digital signature, including hashing, public key algorithms, Message Authentication Codes (MACs), and padding.
此属性标识创建XML数字签名时涉及到的所有加密功能，包括哈希算法、公钥算法、消息身份验证代码(MAC)和填充。
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