On analysis of the principle and application mode of des, a des module which fits for embedded security system such as IC card is realized by topdown design methods.

在详细分析DES的基本原理和应用模式的基础上，结合DES硬件实现的特点，采用正向设计的方法实现了适用于IC卡等有嵌入式安全需要的系统中的DES模块。

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Baggage tags, banknotes with electronics embedded for security and even postage stamps that can be read by smart franking machines are other possible uses.

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Russell Dietz is vice president and chief technology officer at SafeNet, a global leader in information security, and has more than 25 years of technology experience in the data management, security, embedded and distributed systems industries.

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