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。
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.
此方案能够进行双向的身份验证，有效地防止了冒充攻击、重放攻击和小数攻击，从而提高了认证系统的安全性。
This two-way identity authentication scheme effectively prevents imitate attack, replay attack and decimal fraction attack. And the security of authentication system is enhanced.
这不，不幸的是，防止重放从攻击者。
It does not, unfortunately, prevent playback from an attacker.
由此实现了双向的身份验证，同时保证了服务器和用户的安全，可以有效的防止冒充攻击、重放攻击、小数攻击。
The two-way identity authentication is implemented and the security of the host and the users is assured, which can keep them from imitate attack, replay attack and small number attack.
由此实现了双向的身份验证，同时保证了服务器和用户的安全，可以有效的防止冒充攻击、重放攻击、小数攻击。
The two-way identity authentication is implemented and the security of the host and the users is assured, which can keep them from imitate attack, replay attack and small number attack.
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