每一套UTM-1都包含一个USB硬件令牌（Hardware Token），帮助系统进行恢复和故障检查。一旦设备配置错误或没有响应，自带的硬件令牌可将UTM-1恢复到出厂默认设置。
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And a hardware token which was in low cost and a long life was designed for the present deficiencies . Improved One-Time Password Authentication Protocol adopted dual factors identity authentication and the counter value to realize synchronization.
并且针对现有硬件令牌的缺陷设计了成本低，寿命长的硬件令牌。
参考来源 - 基于事件的一次性口令系统的研究与实现·2,447,543篇论文数据，部分数据来源于NoteExpress
文章介绍了一次性口令技术、电子令牌技术、生物识别技术和硬件识别技术。
This paper introduces one time password technology, electronic token technology, biometric technology and hardware recognition technology.
该协议基于现有的以太网硬件基础，在应用层构造虚拟令牌，利用令牌控制来解决网络的访问冲突问题。
This protocol is based on current hardware foundation of Ethernet and solves access conflict through token-control by creating virtual token on application layer.
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