无须重注册的单向通信动态口令认证

动态口令是在系统中或设备上仅对一次会话有效的口令。目前存在的无须重注册的动态口令方案虽然不受认证次数的限制，但仅支持在线认证，不能离线认证。针对以上问题，提出一种无须重注册的单向通信动态口令认证方案。该方案基于无须重注册的方式结合基于时间动态口令方案，在实现离线认证的同时满足认证次数无限和口令有时效，最后证明该方案的安全性。

One-time password authentication for one-way communication without re-registration

One-time password is a password that is valid for only one session on a system or device.The existing one-time password scheme without re-registration which is not limited by the number of authentication only supports online authentication,but can not support offline authentication.To solve the above problems,a one-time password authentication scheme for one-way communication without re-registration was proposed.The scheme combined the time-based one-time password scheme with the way of no re-registration.It can realize the offline authentication while satisfying the infinite authentication times and the password time-effective.Finally,the security of the scheme is proved.