A time signature

Each of these is clicked by the user and has its click-hold time measured to create a user identification signature.

这些部件将被用户逐个单击并且测量单击持续时间以创建用户身份签名。

Because a digital signature is based on public key cryptography, it generally takes much more time to compute a digital signature than a MAC.

由于数字签名是建立在公用密钥密码术基础上的，因此计算一个数字签名所花的时间往往要比计算一个mac长得多。

The result is that if an internal module is used, the first time the client finds out is when either a compile failure occurs — or when a run time failure occurs because the method signature changed.

最终结果是如果使用了某个内部模块，那么客户端第一次找到它时是在出现编译故障或运行时故障时，因为方法签名被修改了。