确认计算机的USB接口是否故障； 数字证书加密锁（USB Token）是否故障；数字证书驱动程序是否正确安装；数字证书加密锁（USB Token）是否被系统正确识别。
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usb身份锁
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Stuxnet is the other most prominent event that highlights the how critical it is to defend against targeted malware being delivered via USB token.
FORBES: Why port control matters
In particular the web giant is exploring hardware authentication options and experimenting with a device called YubiKey -- a USB-based token system.
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