Method and apparatus for fingerprinting magnetic media
AssigneeWashington University
InventorsRonald S. Indeck, Marcel W. Muller
Life of this patent
Estimating the term…
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.
Claims122
A device for fingerprinting an object for the later determination of its identity, said object including at least in part, a magnetic medium portion, said device having means for determining a remanent noise for said medium portion, said remanent noise comprising the fingerprint for said object, and means for recording said remanent noise for later comparison with the later determination of said remanent noise to thereby identify said object.
An object having its fingerprint recorded for the later verification of its identity, said object having a magnetic medium portion, said fingerprint comprising a remanent noise for said magnetic medium portion.
A device for authenticating an object having a fingerprint recorded, said object having a magnetic medium portion, said fingerprint comprising a remanent noise for said medium portion, said device including means for reading said recorded fingerprint, means for translating said remanent noise from said fingerprint, means for determining a remanent noise directly from said magnetic medium portion, and means for comparing said translated remanent noise with said determined remanent noise to determine whether they match, thereby authenticating said object.
A method for authenticating an object, said object including at least in part a magnetic medium portion, said object having a fingerprint recorded, said fingerprint comprising a previously determined remanent noise for said medium portion, said method comprising the steps of:
- determining a remanent noise directly from said medium portion,
- reading said fingerprint, and
- comparing said determined remanent noise with said fingerprint.
A method for fingerprinting an object for the later determination of its identity, said object including at least in part a magnetic medium portion, said method comprising the steps of determining a remanent noise for said medium portion, said remanent noise comprising said fingerprint, and recording said fingerprint on said object for the later comparison thereof with the later determination of said remanent noise.
A device for fingerprinting an object for the later determination of its identity, said object including at least in part, a magnetic medium portion, said device having means for determining a ramanent noise for a length of no more than about several hundreds of micrometers of said medium portion, said ramanent noise comprising the fingerprint for said object, and means for recording said remanent noise for later comparison with the later determination of said remanent noise to thereby identify said object.
A device for fingerprinting an object for the later determination of its identity, said object including at least in part, a magnetic medium portion, said device having means for determining a remanent noise from a magnetic micro-structure for said medium portion, said remanent noise comprising the fingerprint for said object, and means for recording said remanent noise for later comparison with the later determination of said remanent noise to thereby identify said object.
A device for fingerprinting an object for the later determination of its identity, said object including at least in part, a uniformly manufactured magnetic medium portion, said device having means for determining a remanent noise for said medium portion, said remanent noise comprising the fingerprint for said object, and means for recording said remanent noise for later comparison with the later determination of said remanent noise to thereby identify said object.
An object having its fingerprint recorded for the later verification of its identity, said object having a magnetic medium portion, said fingerprint comprising a remanent noise for no more than about several hundreds of micrometers of said magnetic medium portion.
An object having its fingerprint recorded for the later verification of its identity, said object having a magnetic medium portion, said fingerprint comprising a remanent noise from a magnetic micro-structure for said magnetic medium portion.
An object having its fingerprint recorded for the later verification of its identity, said object having a uniformly manufactured magnetic medium portion, said fingerprint comprising a remanent noise for said magnetic medium portion.
A device for authenticating an object having a fingerprint recorded, said object having a magnetic medium portion, said fingerprint comprising a remanent noise for a length of no more than about several hundreds of micrometers of said medium portion, said device including means for reading said recorded fingerprint, means for translating said remanent noise from said fingerprint, means for determining a remanent noise directly from said magnetic medium portion, and means for comparing said translated remanent noise with said determined remanent noise to determine whether they match, thereby authenticating said object.
A device for authenticating an object having a fingerprint recorded, said object having a magnetic medium portion, said fingerprint comprising a remanent noise from a magnetic micro-structure for said medium portion, said device including means for reading said recorded fingerprint, means for translating said remanent noise from said fingerprint, means for determining a remanent noise directly from said magnetic medium portion, and means for comparing said translated remanent noise with said determined remanent noise to determine whether they match, thereby authenticating said object.
A device for authenticating an object having a fingerprint recorded, said object having a uniformly manufactured magnetic medium portion, said fingerprint comprising a remanent noise for said medium portion, said device including means for reading said recorded fingerprint, means for translating said remanent noise from said fingerprint, means for determining a remanent noise directly from said magnetic medium portion, and means for comparing said translated remanent noise with said determined remanent noise to determine whether they match, thereby authenticating said object.
A method for authenticating an object, said object including at least in part a magnetic medium portion, said object having a fingerprint recorded, said fingerprint comprising a previously determined remanent noise for a length of no more than about several hundreds of micrometers of said medium portion, said method comprising the steps of:
- determining a remanent noise directly from said medium portion,
- reading said fingerprint, and
- correlating said determined remanent noise with said fingerprint, said correlation thereby indicating if said object is authentic.
A method for authenticating an object, said object including at least in part a magnetic medium portion, said object having a fingerprint recorded, said fingerprint comprising a previously determined remanent noise from a magnetic micro-structure for said medium portion, said method comprising the steps of:
- determining a remanent noise directly from said medium portion,
- reading said fingerprint, and
- correlating said determined remanent noise with said fingerprint, said correlation thereby indicating if said object is authentic.
A method for authenticating an object, said object including at least in part a uniformly manufactured magnetic medium portion, said object having a fingerprint recorded, said fingerprint comprising a previously determined remanent noise for said medium portion, said method comprising the steps of:
- determining a remanent noise directly from said medium portion,
- reading said fingerprint, and
- correlating said determined remanent noise with said fingerprint, said correlation thereby indicating if said object is authentic.
A method for fingerprinting an object for the later determination of its identity, said object including at least in part a magnetic medium portion, said method comprising the steps of determining a remanent noise for a length of no more than about several hundreds of micrometers of said medium portion, said remanent noise comprising said fingerprint, and recording said fingerprint on said object for the later comparison thereof with the later determination of said remanent noise.
A method for fingerprinting an object for the later determination of its identity, said object including at least in part a magnetic medium portion, said method comprising the steps of determining a remanent noise from a magnetic micro-structure for said medium portion, said remanent noise comprising said fingerprint, and recording said fingerprint on said object for the later comparison thereof with the later determination of said remanent noise.
A method for fingerprinting an object for the later determination of its identity, said object including at least in part a uniformly manufactured magnetic medium portion, said method comprising the steps of determining a remanent noise for said medium portion, said remanent noise comprising said fingerprint, and recording said fingerprint on said object for the later comparison thereof with the later determination of said remanent noise.
Dependencies are inferred from the claim text.