A replay attack is where a valid message is intercepted and replayed back to the service.
重播攻击是这样一类攻击：它可以拦截有效的消息，然后再将该消息重播回服务。
Replay attack — Re-sending a previously valid message for malicious effect, possibly where only parts of the message (such as the security token) are replayed.
应答攻击——为实现恶意的效果，重新发送一个以前曾经有效的消息，其中可能只是重放部分消息(如安全令牌)。
If Enterprise C re-sends the order to Enterprise B then Enterprise B will accept it as another order from Enterprise A (a replay attack by Enterprise C).
如果丙企业将该订单重复发送给乙企业，那么乙企业就会将其当作另一个来自甲企业的订单（来自丙企业的再现攻击）。
In their scheme users can change their passwords freely and the remote system does not need the directory of passwords or verification tables, and replay attack can be avoided.
在他们的方案中，用户能随意更改口令，远程系统不需要存储用户的口令表或验证表，并能防止重放攻击。
By using authentication, this solution avoids the counterfeit attack and replay attack directed against the Mobile IP register process.
该方案通过对移动IP注册消息的认证，避免了针对注册过程的假冒攻击和重发攻击。
The WEB service secure communication model can satisfy the basic requirements of secure communication, and performs replay attack resistance efficiently.
WEB服务安全通信模型能够满足安全通信的基本要求，并且能够较为高效地抵御重传攻击。
But it still has some security hidden troubles, for instance: replay attack, password guessing, inter-session chosen plaintext attacks.
但仍存在一些隐患，例如：重放攻击、密码猜测、会话中选择明文攻击等等。
Experimental results show that, this protocol can effectively avoid the problem of clock synchronization when only use timestamp, and good anti-replay attack capacity.
实验结果表明，该协议能避免单纯采用时间戳所带来的时钟同步问题，具有较好的抗重放攻击能力。
Experimental results show that, this protocol can effectively avoid the problem of clock synchronization when only use timestamp, and good anti-replay attack capacity.
实验结果表明，该协议能避免单纯采用时间戳所带来的时钟同步问题，具有较好的抗重放攻击能力。
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