Registers – Systems controlled by data bearing records – Credit or identification card systems
Patent
1997-08-20
2000-03-28
Hajec, Donald
Registers
Systems controlled by data bearing records
Credit or identification card systems
235380, 235382, 902 28, 380 24, H04L 900, G06K 500
Patent
active
060420065
ABSTRACT:
An authentication system having a first device and a second device between which signals may be communicated. The first device includes a first memory for storing a definition signal and the first device generates a first signal to be communicated to the second device. The first device also generates a first alteration signal, and introduces an alteration into a first section of the definition signal stored in the first memory in accordance with the first alteration signal. The second device includes a second memory for storing the definition signal, and generates, in response to a receipt of the first signal, a second signal to be communicated to the first device. The second signal includes a second section of the definition signal stored in the second memory, and the second device also generates a second alteration signal and introduces an alteration into a third section of the definition signal stored in the second memory in accordance with the second alteration signal. In addition, the first device compares the second section of the definition signal in the second signal originating from the second device with a corresponding section of the definition signal stored in the first memory, and introduces the alteration into the first section of the definition signal stored in the first memory in accordance with a comparison result. The first and third sections, moreover, are corresponding sections of the definition signals stored in the first and second memories, respectively.
REFERENCES:
patent: 4630201 (1986-12-01), White
patent: 5753898 (1998-05-01), Hekstra
patent: 5802176 (1998-09-01), Audebert
Textbook entitled "Cryptography: A New Dimension In Computer Data Security--A Guide for the Design and Implementation of Secure Systems", by Carl H. Meyer, et al, published by John Wiley & Sons, 1982, Title page, Table of Contents (ix-xviii), Chapter 2, pp. 13-112; Chapter 4, pp. 192-270; Chapters 10 and 11, pp. 429-606.
Textbook entitled "Contemporary Cryptology The Science of Information Integrity", edited by Gustavus J. Simmons, published by IEEE Press, 1982, Title page, Table of Contents (iii-vi), Chapter 2, pp. 65-134; Chapter 4, pp. 177-288; Chapter 12, pp. 561-613.
Hekstra Andries Pieter
Van Tilburg Johan
Dunn Drew A.
Hajec Donald
Koninklijke PTT Nederland N.V.
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