Cryptography – Particular algorithmic function encoding – Nbs/des algorithm
Patent
1985-01-14
1989-01-24
Cangialosi, Salvatore
Cryptography
Particular algorithmic function encoding
Nbs/des algorithm
380 23, 380 49, 34082534, 235382, H04K 100, G07P 700
Patent
active
048005908
ABSTRACT:
A computer access system includes a password generator (10) and an lock computer (50) connected to receive passwords generated by the password generator and grant access to a host computer (52) when a password from the password generator (10) matches a password separately generated by the lock computer (50). The password generator (10) and the lock computer (50) have corresponding pseudo-random number sequences stored in memories (26 and 90). The password generator (10) and the lock computer (50) have synchronized clocks (30 and 84), which define time intervals. During a given time interval, entry of a personal identification number in password generator (10) will cause the password generator (10) to generate a unique password from the random number sequence in memory (26) and time interval information from clock (30). The user transmits the so-generated password to the lock computer (50), which independently generates a comparison password from the corresponding pseudo-random number sequence stored in memory (90), and the time interval defined by clock (84). If the passwords match, access to computer (52) is granted by the lock computer (50). Since the valid passwords change with each time interval, subsequent use of an intercepted password will not grant access to the computer.
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Cangialosi Salvatore
Higgins Willis E.
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