在计算机安全中 哈希链 是一种由单个密钥或密码生成多个一次性密钥或密码的一种方法。

哈希链 是将密码学中的哈希函数循环地用于一个字符串。(即将所得哈希值再次传递给哈希函数得至其哈希值)

例：

一个长度为4哈希链，通常记

A hash chain is the successive application of a cryptographic hash function to a piece of data. In computer security, a hash chain is a method to produce many one-time keys from a single key or password. For non-repudiation a hash function can be applied successively to additional pieces of data in order to record the chronology of data's existence.