本文档描述了一种名为DUKPT的一次一密的密码产生方法，广泛用于金融业的用户密码加解密。-The DUEPT process ensures that every PIN entered at a specific PED is encrypted under a different key.

ANSI X9.24-1:2009. Retail Financial Services Symmetric Key Management Part 1: Using Symmetric Techniques.