H - Electricity – 03 – M
Patent
H - Electricity
03
M
354/67
H03M 7/28 (2006.01) G06F 21/00 (2006.01) G07F 7/10 (2006.01) G06F 1/00 (2006.01)
Patent
CA 2023872
An improved security system, including a portable smart card and a host computer, eliminates the need for the computer to store individual personal identification (ID) numbers for each user seeking access to the computer. Instead, the computer stores a first encryption algorithm E1 used in converting a particular identification number (ID)n into a secret code Sn for that particular user. Sn also exists within the memory of the smart card having been loaded into its memory atthe time of issue. A challenge number C is generated by the computer and transmitted to the smart card. Within the smart card and the computer, microprocessors respond to the challenge number C, the secret code Sn, and a second encryption algorithm E2 in order to generate response numbers Rn and R'n respectively. Thereafter, Rn is transmitted to the computer where it is comparedwith R'n. A favorable comparison is necessary for gaining access to the computer.
Claus David Michael
Coutinho Roy S.
Murphy Kevin Dean
Snavley James Damon
Zempol Kenneth Robert
American Telephone And Telegraph Company
Kirby Eades Gale Baker
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