Passwords currently are simply a sequence of characters, ideally known only to those with authority to access the password-protected resource. Is there a simple way to add TIMING to the entry of the characters of a password? Suppose my password is “1234”. If I wait 1 second between the 1 and the 2 then type 3 as quickly as possible after the 2 and then wait another 1 second before typing the 4, this would constitute a “Time Signature”. If this “time signature” could be recognised in addition to the simple character sequence, it would seriously increase security. It would also seriously undermine the effectiveness of current key logger spyware. Has anyone implemented such a scheme? Does/did it work? Is/was it more trouble than the benefits were worth?