![](https://secure.gravatar.com/avatar/499a2ec78efd67f5ced7fcb55e7d0825.jpg?s=120&d=mm&r=g)
6 Jul
2018
6 Jul
'18
2:33 a.m.
Vasco uses DES (I don't know the details).
I'm sorry, I already read this somewhere on the web; the term I should have used was "protocol": how do they use DES to create those numbers - do they encrypt a counter, or a time, or a shared secret - what? Does anybody know? [I assume they encrypt something based on 1) the serial number and 2) a time or a counter.] Plus, there are less than 24 (7 * 3.3) bits in 7 digits; how does it get these particular 24 out of the 64 in a block? Thanks for any help, Mark