Cryptography – Cryptanalysis
Patent
1993-04-09
1994-11-15
Cain, David C.
Cryptography
Cryptanalysis
380 4, 380 23, 380 25, 235440, 235380, 235437, 235448, 235449, G11B 2328, H04K 100, H04L 900, G06K 708
Patent
active
053655869
ABSTRACT:
A method and apparatus is disclosed for determining the remanent noise in a magnetic medium by DC saturation of a region thereof and measurement of the remaining DC magnetization. A conventional magnetic recording transducer may be used to determine the remanent noise. Upon determination, the remanent noise may then be digitized and recorded on the same magnetic medium to thereby "fingerprint" the magnetic medium. This "fingerprint" may then be later used to verify and authenticate the magnetic medium as being an original. In such manner, any magnetic medium, or any object having an associated magnetic medium, may be "fingerprinted" including credit cards, computer programs, compact discs, videotapes, cassette tapes, etc.
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Indeck Ronald S.
Muller Marcel W.
Cain David C.
Washington University
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