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。

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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。

youdao