The S-Key system, a so called challenge-response authentication system (developed at Bellcore) is a one-time password system, i.e. each password is valid only once.
These one-time passwords are actually 6 short English words, that are
generated by a secure computer system. A list of these passwords is
printed on a credit-card size piece of paper, called
and the user is using all of them in sequence. The authentication procedure
will ask for the key with given sequence number, as in:
Skey Challenge "s/key 512 gz12345":
In this challenge, you will find to items of interest: the
sequence-number (512 in this example), and some internal
seed ("gz12345" in this example). The latter
is printed on top of the S/Key-card you have in front
of you (so you can make sure both you and the authentication system
agree upon you). The sequence-number will appear on your
list of passwords. To authenticate, you type in the corresponding
key, like in:
Skey Challenge "s/key 512 gz12345": FAT FEND DEFY FUEL LENS ORE
If you prefer to type the key in lower-case, you may choose to do so.
Next time you access the system, you will be prompted to ask for key with sequence number 511. If the sequence-number approaches the minimal number available on your S/Key-card, you should apply for a new one.
Your personal S/Key-card will be handed over to you personally.
An alternative route is to walk into any one of the Computer Systems Group offices and ask for a S/Key-card. You will then be directed to the right person to handle your request.