Cryptography – Particular algorithmic function encoding – Nbs/des algorithm
Patent
1994-09-09
1996-08-13
Cain, David C.
Cryptography
Particular algorithmic function encoding
Nbs/des algorithm
380 3, 380 22, 235493, 360 2, H04K 100
Patent
active
055464629
ABSTRACT:
A method and apparatus is disclosed for determining the remanent noise in a magnetic medium by, for example, 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. The magnetic medium may be of a type adapted to record information magnetically or, even more broadly, any magnetic surface or substance that can be sensed through its magnetic field. In such manner, any magnetic medium, or any object having an associated magnetic medium, may be "fingerprinted" including credit cards, computer program diskettes, magneto-optic discs, videotapes, cassette tapes, bank checks, stock certificates, etc.
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Engel George Lawrence
Hege Alan L.
Indeck Ronald S.
Muller Marcel W.
Cain David C.
Washington University
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