Method and apparatus for improved fingerprinting and authenticat

Cryptography – Cryptanalysis

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

380 23, H04L 900

Patent

active

057402442

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.

REFERENCES:
patent: 3896266 (1975-07-01), Waterbury
patent: 4038596 (1977-07-01), Lee
patent: 4806740 (1989-02-01), Gold et al.
patent: 4882195 (1989-11-01), Butland
patent: 4906988 (1990-03-01), Copella
patent: 4985614 (1991-01-01), Pease et al.
patent: 5027113 (1991-06-01), Bonnaval-Lamothe et al.
patent: 5159182 (1992-10-01), Eisele
patent: 5177344 (1993-01-01), Pease
patent: 5191613 (1993-03-01), Graziano et al.
patent: 5194289 (1993-03-01), Butland
patent: 5365586 (1994-11-01), Indeck et al.
patent: 5428683 (1995-06-01), Indeck et al.
"Smart cards gear up for belated success" by Legg, EDN, Oct. 1991, 51-58.
"Smart-card applications' hidden problems add to designers' challenges" by Legg, EDN, Mar. 1992, 83-90.
"Noise Correlation of Magnetic Thin Film Media" by Mian, Indeck, and Muller. Japanese Journal of Applied Physics, vol. 30, No. 8B, Aug. 1991, pp. L1483-L1485.
"Determination of a Track's Edge by Differential Power Spectrum" by Indeck, Mian, and Muller. Japanese Journal of Applied Physics, vol. 31, No. 8A, Aug. 1992, pp. L1065-L1067.
"Spatial Noise Phenomena of Longitudinal Magnetic Recording Media" by Hoinville, Indeck, and Muller. IEE Transactions on Magnetics, vol. 28, No. 6, Nov. 1992, pp. 3398-3406.
"Measurements and Modeling of Noise in DC-Erased Thin-Film Media" by Vos, Tanaka, and Judy, IEEE Transactions on Magnetics, vol. 26, No. 5, Sep. 1990, pp. 2149-2151.
"Spatial Structure of Media Noise in Film Disks" by Yarmchuk, IEEE Transactions on Magnetics, vol. Mag-22, No. 5, Sep. 1986, pp. 877-882.
"Noise from Unsaturated DC Erasure and Peak Shift of Signals in Longitudinal Thin-Film Disk Media" by Ohara, Sato, IEEE Transactions on Magnetics, vol. Mag-23, No. 5, Sep. 1987, pp. 2380-2382.
"Novel Applications of Cryptography in Digital Communications" by Omura, IEEE Communications Magazine, May 1990, pp. 21-29.
"A Physically Based Approach to Information Theory for Thin Film Magnetic Recording" by O'Sullivan, Porter, Indeck and Muller, Proceedings of the Thirtieth Allerton Conference on Communication, Control, and Computing, Oct. 1992.
"Transverse Correlation Length in Thin Film Media" by Mian, Indeck, and Muller, IEEE Transactions on Magnetics, vol. 28, No. 5, Sep. 1992, pp. 2733-2735.
"A Magnetoresistive Gradiometer" by Indeck, Judy, and Iwasaki, IEEE Transactions on Magnetics, vol./ 28, No. 6, pp. 2617-2619.
"An Analysis of Multilayered Thin-Film Magnetic Field Gradiometers Having a Superconducting Spacer" by Indeck, Journal of The Magnetics Society of Japan, vol. 13, Supplement, No. S1 (1989).
"Interaction Factors of a Multi-layered Magnetic Thin Film System" by Mian and Indeck, IEEE Transactions on Magnetics, vol. 26, No. 5., Sep. 1990.
"An interaction matrix for the energy analysis of an n-layered magnetic thin-film system" by Mian and Indeck, Journal of Magnetism and Magnetic Materials, 96 (1991), pp. 248-260.
"dc track edge interactions" by Indeck, Reising, Hoinville, and Muller, Journal of Applied Physics, 69(8), Apr. 15, 1991, pp. 4721-4723.
"Track edge fluctuations" by Muller and Indeck, Journal of Applied Physics, 67(9), May 1, 1990, pp. 4683-4685.
"In Situ Measurement of the Remanence Curve of Magnetic Recording Media" by Hoinville, Ornes, Murdock, and Muller, IEEE Transactions on Magnetics, vol. 24, No. 6, Nov. 1988, pp. 2976-2978.
"An in situ measurement of intergranular coupling in magnetic film media" by Mian, Indeck, and Muller, Journal of Applied Physics, 73(4), Feb. 15, 1993, pp. 2027, 2028.
"Noise Characterization of Perpendicular Media" by Indeck, Johnson, Mian, Hoinville, and Muller, Journal of the Magnetics Society of Japan, vol. 15 Supplement, No. S2 (1991), pp. 173-178.
"Authentication of Forensic Audio Recordings" by Koenig, J. Audio Eng. Soc., vol. 38, No. 1/2, Jan./Feb. 1990, pp. 3-33.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Method and apparatus for improved fingerprinting and authenticat does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method and apparatus for improved fingerprinting and authenticat, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for improved fingerprinting and authenticat will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-644166

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.