Cryptography – Particular algorithmic function encoding – Nbs/des algorithm
Patent
1997-05-30
1999-08-17
Hayes, Gail O.
Cryptography
Particular algorithmic function encoding
Nbs/des algorithm
380 23, 380 24, H04K 100
Patent
active
059405112
ABSTRACT:
A method and apparatus for secure entry and authentication of a multi-digit personal identification number (PIN) is described. An authenticator generates a random number, and provides that number, or a function thereof, to a user. The user is prompted to encode each digit of the PIN number, one digit at a time, by performing a mathematical operation on the digit using the number provided by the authenticator. The encoded PIN digit is provided to the authenticator which reverses the steps performed by the user to regenerate and verify the user's PIN. The user is prompted to encode subsequent digits of the PIN only after (1) a previous digit is encoded, (2) the encoded digit is provided to an input device for the authenticator, (3) and a new random number is generated and that random number, or a function thereeof, is provided to the user for encoding a subsequent PIN digit.
REFERENCES:
patent: 5060263 (1991-10-01), Bosen et al.
patent: 5093861 (1992-03-01), Gaham
patent: 5130519 (1992-07-01), Bush et al.
patent: 5168520 (1992-12-01), Weiss
patent: 5196840 (1993-03-01), Leith et al.
patent: 5239583 (1993-08-01), Parrillo
patent: 5655020 (1997-08-01), Powers
Hayes Gail O.
Lucent Technologies - Inc.
Sayadian Hrayr A.
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