Patent US5616904A successfully refreshed from Google Patents.
US5616904A
Expired / Lapsed
US
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Data verification method and magnetic media therefor
Assignee: XTec Inc
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Filing: 1995-04-12
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Granted: 1997-04-01
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Expires: 2015-04-12
Abstract
Abstract Magnetic media containing data and method for data verification are disclosed. The data verification method utilizes the relative position of specific features of magnetic media signals, such as, peak zero crossings, the ratio of preselected amplitudes, the locii of preselected points along the signal, the RMS value of the waveform and the like. In the preferred embodiment, the ratio of the separation of adjacent pulses in the signal is employed. The deviation of the precise location of the placement of the peak points in the signal waveform is referred to as "jitter". This "jitter" is enhanced to provide a pattern of "jitter" or a magnetic "signature" that is random, non-reproducible and that can be used to positively identify a particular specimen of magnetic media and the associated data. The magnetic jitter pattern or security signature can be separate from or an integral part of the data recorded on the magnetic media. The data verification method and magnetic media have particular application in the field of credit cards.
Inventors
- 👤 Alberto J. Fernadez
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 21:32
CPC Classifications
G; G06; G06K; G06K5/00; G06K5/02; G06K1/00; G06K1/12; G06K1/125; G06K5/04; G06K7/00; G06K7/08; G06K7/082; G06K7/083; G06K7/084
Claims Analysis
Total Claims: 30
Claim 1
Independent Claim
79 words
A method for generating a magnetic security signature on a magnetically recordable media comprising the steps of: A. producing a data representative signal to be recorded on said magnetically recordable media; and, B. recording the data representative signal on the magnetically recordable media while controlling the rate of change of the recording signal to extend the length of time that the magnetic flux transition remains on the most curved portion of the hysteresis loop of the magnetically recordable media.
Claim 2
Independent Claim
79 words
A method for generating a magnetic security signature on a magnetically recordable media comprising the steps of: A. producing a data representative signal to be recorded on said magnetically recordable media; and, B. recording the data representative signal on the magnetically recordable media while controlling the rate of change of the recording signal to extend the length of time that the magnetic flux transition remains on the most curved portion of the hysteresis loop of the magnetically recordable media.
Claim 3
Independent Claim
111 words
A method of providing for the security of magnetically encoded data on a magnetically recordable media, comprising: A. encoding a data representative signal magnetically on the media; B. deriving a timing data stream of the inherent timing variations of the magnetically encoded data in combination with the randomly varying effect of the magnetic media by reading the magnetically encoded data; C. storing a representation of the timing data stream as an initial jitter signature number; D. comparing the timing data stream of a subsequent reading of the magnetically encoded data to the timing data stream generated from the initially stored jitter signature number; and, E. indicating the results of the comparison.
Claim 4
Independent Claim
111 words
A method of providing for the security of magnetically encoded data on a magnetically recordable media, comprising: A. encoding a data representative signal magnetically on the media; B. deriving a timing data stream of the inherent timing variations of the magnetically encoded data in combination with the randomly varying effect of the magnetic media by reading the magnetically encoded data; C. storing a representation of the timing data stream as an initial jitter signature number; D. comparing the timing data stream of a subsequent reading of the magnetically encoded data to the timing data stream generated from the initially stored jitter signature number; and, E. indicating the results of the comparison.
Claim 5
Dependent Claim
23 words
The method of claim 2, wherein the jitter signature is enhanced by recording a plurality of random saturated flux transitions on the media.
Claim 6
Dependent Claim
19 words
The method of claim 2, wherein the jitter signature is enhanced by recording deliberate random jitter on the media.
Claim 7
Dependent Claim
51 words
The method of claim 2 wherein the jitter signature is enhanced by controlling, during recording, the rate of change of the recording data representative signal, to extend the length of time that the magnetic flux transition remains on the most curved portion of the hysteresis loop of the magnetically recordable media.
Claim 8
Dependent Claim
29 words
The method of claim 2, wherein the jitter signature is derived from a measurement of the ratio of the separation of adjacent peaks of the encoded data representative signal.
Claim 9
Dependent Claim
24 words
The method of claim 2, wherein high resolution digital techniques are used to read the timing data stream of the encoded data representative signal.
Claim 10
Dependent Claim
18 words
The method of claim 2, wherein the jitter signature is stored in a representative form on the media.
Claim 11
Dependent Claim
16 words
The method of claim 2, wherein the jitter signature is stored in a digital coding scheme.
Claim 12
Independent Claim
122 words
An apparatus for providing for the security of magnetically encoded data on a magnetically recordable media, comprising: a means for magnetically encoding a data representative signal on the media; a means for detecting a timing data stream of the inherent timing variations of the magnetically encoded data in combination with the randomly varying effect of the magnetic media by reading the magnetically encoded data signal; a means for storing a representation of the timing data stream as an initial jitter signature number; a means for comparing the timing data stream of a subsequent reading of the magnetically encoded data to the timing data stream generated from the initially stored jitter signature number; and, a means for indicating the results of the comparison.
Claim 13
Independent Claim
122 words
An apparatus for providing for the security of magnetically encoded data on a magnetically recordable media, comprising: a means for magnetically encoding a data representative signal on the media; a means for detecting a timing data stream of the inherent timing variations of the magnetically encoded data in combination with the randomly varying effect of the magnetic media by reading the magnetically encoded data signal; a means for storing a representation of the timing data stream as an initial jitter signature number; a means for comparing the timing data stream of a subsequent reading of the magnetically encoded data to the timing data stream generated from the initially stored jitter signature number; and, a means for indicating the results of the comparison.
Claim 14
Dependent Claim
23 words
The apparatus of claim 10, further comprising a means to enhance the jitter signature by recording random saturated flux transitions on the media.
Claim 15
Dependent Claim
22 words
An apparatus of claim 10, further comprising a means to enhance the jitter signature by recording deliberate random jitter on the media.
Claim 16
Dependent Claim
54 words
The apparatus of claim 10, further comprising a means to enhance the jitter signature by controlling, during recording, the rate of change of the recording data representative signal, to extend the length of time that the magnetic flux transition remains on the most curved portion of the hysteresis loop of the magnetically recordable media.
Claim 17
Dependent Claim
21 words
The apparatus of claim 10, further comprising a means to store the jitter signature in a representative form on the media.
Claim 18
Dependent Claim
23 words
The apparatus of claim 10, further comprising a means to store the jitter signature in a representative form in a digital coding scheme.
Claim 19
Independent Claim
64 words
A method of identifying a magnetic security signature from magnetically encoded data, comprising the steps of: A. detecting a timing data stream of the inherent timing variations of the magnetically encoded data in combination with the randomly varying effect of the magnetic media by reading the magnetically encoded data after encoding; and, B. deriving a representation of the jitter pattern of the data stream.
Claim 20
Independent Claim
64 words
A method of identifying a magnetic security signature from magnetically encoded data, comprising the steps of: A. detecting a timing data stream of the inherent timing variations of the magnetically encoded data in combination with the randomly varying effect of the magnetic media by reading the magnetically encoded data after encoding; and, B. deriving a representation of the jitter pattern of the data stream.
Claim 21
Dependent Claim
18 words
The method of claim 16, further comprising the step of: C. representing the jitter pattern as a checksum.
Claim 22
Dependent Claim
21 words
The method of claim 17, further comprising the step of: D. storing the checksum in a representative form on the media.
Claim 23
Dependent Claim
20 words
The method of claim 16, further comprising the step of: C. representing the jitter pattern as a plurality of checksums.
Claim 24
Dependent Claim
23 words
The method of claim 19, further comprising the step of: D, storing the plurality of checksums in a representative form on the media.
Claim 25
Independent Claim
75 words
An apparatus for identifying magnetically recordable media having a data representative signal recorded thereon, using controlled variations in the timing of encoded data in combination with the random effect of the magnetic media, comprising: a means for determining an existing pattern of jitter in at least a portion of the recorded data representative signal by reading the magnetically encoded data after encoding; and, a means for generating data representative of the existing pattern of jitter.
Claim 26
Independent Claim
75 words
An apparatus for identifying magnetically recordable media having a data representative signal recorded thereon, using controlled variations in the timing of encoded data in combination with the random effect of the magnetic media, comprising: a means for determining an existing pattern of jitter in at least a portion of the recorded data representative signal by reading the magnetically encoded data after encoding; and, a means for generating data representative of the existing pattern of jitter.
Claim 27
Dependent Claim
21 words
The apparatus of claim 21, wherein the data representative of the existing pattern of jitter is recorded in a separate database.
Claim 28
Dependent Claim
23 words
The apparatus of claim 21, wherein the data representative of the existing pattern of jitter is recorded in a separate piece of media.
Claim 29
Dependent Claim
20 words
The apparatus of claim 21, wherein the data representative of the existing pattern of jitter is recorded on the media.
Claim 30
Dependent Claim
81 words
The apparatus of claim 21 further comprising: a means for determining a subsequent pattern of jitter in said at least a portion of the recorded data representative signal by reading the magnetically encoded data; a means for generating data representative of the subsequent pattern of jitter; a means for comparing the data representative of the existing pattern of jitter and the data representative of the subsequent pattern of jitter; and, a means for utilizing the results of the data comparing means.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-03-31 | 2000-09-30 | 2001-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-03-31 | 2004-09-30 | 2005-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-03-31 | 2008-09-30 | 2009-04-01 | $7700.00 | Window Closed / Lapsed |