The safe information technology principle is introduced of USB SoftDog in E-commerce is analyzed.

介绍了安全信息加密的技术原理，着重对usb加密狗在电子商务的应用进行分析。

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This paper introduces the intelligent feature of the EZ-USB chip. The design and implementation of a USB Softdog based on AN2132QC are also given.

本文介绍了带智能USB控制内核的EZ-USB单片机芯片的特点，重点阐述了基于AN2132QC芯片开发的USB软件加密狗的原理和实现方法。

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