Securing magnetically encoded data using timing variations in encoded data

• US 5,254,843 A
• Filed: 08/07/1991
• Issued: 10/19/1993
• Est. Priority Date: 08/07/1991
• Status: Expired due to Fees

• Current Assignee: John E. Hynes, Stephen A. Conner
• Original Assignee: John E. Hynes, Stephen A. Conner
• Inventors: Conner, Stephen A., Hynes, John E.
• Primary Examiner(s): Shepperd, John
• Assistant Examiner(s): Chin, Esther
• Application Number:
  US07/741,762
• Time in Patent Office: 804 Days
• Field of Search: 235/449, 235/493, 235/450, 340/825.34, 380/3, 380/22
• US Class Current: 235/449
• CPC Class Codes: G06K 1/125 by magnetic means
• CPC Class Codes: G06K 7/084 sensing magnetic material by relative movement detecting flux changes without altering its magnetised state

Abstract

This invention relates to a method of securing magnetically encoded data from altering, forging, or counterfeiting. The invention pertains to magnetic storage media such as magnetic tape, magnetic striped cards, and other documents or objects which contain magnetic media. This invention utilized the inherent variations in the timing of magnetically encoded data in combination with the random effect of the magnetic media. Data is protected by reading the original encoded data just after encoding and storing this initial timing data stream. It is authenticated by a comparison of the timing data stream of any subsequent reading of this encoded data to the original timing data stream. Acceptance criterion depends on the magnetic media and applications chosen.

Claims

1. A method of securing magnetically encoded data by a means of using inherent variations in the timing of magnetically encoded data in combination with the randomly varying effect of the magnetic media comprising:

deriving the inherent timing variations of the data by reading the magnetically encoded data after initial encoding;

storing the initial timing data stream by representation as the initial Jitter Signature number;

comparing the jitter pattern of the timing data stream of any subsequent reading of the magnetically encoded data to the initial timing data stream generated from the stored initial Jitter Signature number; and

indicating the results of the comparison.

2. A method as in claim 1 with the jitter representation of the initial timing data stream encoded and stored in a track of data on the card.

3. A method as in claim 1 with the jitter representation of the initial timing data stream encoded and stored in a database.

4. A method as in claim 1 with the jitter enhanced by a controlled amount of deliberate jitter.

5. A method as in claim 4 with the jitter enhanced by deliberate random jitter by means of a random number generator.

6. A method as in claim 1 with the jitter enhanced by a random amount of media enhanced jitter.

7. A method as in claim 1 with the means to detect the timing variations of oriented magnetic structures of the magnetic media and to create a Jitter Signature number.

8. A method as in claim 1 with the jitter enhanced by a predetermined percentage of deliberate jitter.

9. A method as in claim 1 with the means to modulate the jitter to a pre-selected pattern.

10. A method of securing magnetically encoded data from altering, buffering, counterfeiting, copying, forging, and skimming by means of detecting the random varying effect of the magnetic media and combining it with the inherent variations in the timing of magnetically encoded data comprising:

reading the magnetically encoded data after encoding;

storing the initial timing data stream as a representation as the initial Jitter Signature number;

comparing the jitter pattern of the timing data stream of subsequent reading of the magnetically encoded data to the initial timing data stream generated from the stored initial Jitter Signature number; and

indicating the results of the comparison.

11. A method as in claim 10 with the jitter representation of the initial timing data stream encoded and stored in a track of data on the card.

12. A method as in claim 10 with the jitter representation of the initial timing data stream encoded and stored in a database.

13. A method as in claim 10 with the jitter enhanced by a controlled amount of deliberate jitter.

14. A method as in claim 13 with the jitter enhanced by deliberate random jitter by means of a random number generator.

15. A method as in claim 10 with the jitter enhanced by a random amount of media enhanced jitter.

16. A method as in claim 10 with the means to detect the timing variations of oriented magnetic structures and to create a Jitter Signature number.

17. A method as in claim 10 with the jitter enhanced by a predetermined percentage of deliberate jitter.

18. A method as in claim 10 with the means to modulate the jitter to a pre-selected pattern.

19. An apparatus to determine the unique Jitter Signature pattern and to verify the authenticity of magnetically encoded data by means of using inherent variations in the timing of encoded data in combination with the random effect of the magnetic media, the apparatus comprising:

a means for reading the magnetically encoded data after encoding;

a means for detecting the timing data stream;

a means for storing the initial timing data stream by representation as the initial Jitter Signature number;

a means for comparing the jitter pattern of the timing data stream of any subsequent reading of the magnetically encoded data to the initial timing data stream generated from the stored initial Jitter Signature number; and

a means for indicating the results of the comparison.

20. An apparatus as in claim 19 with the means to encode and store the jitter representation of the initial timing data stream in a track of data on the card.

21. A method as in claim 19 with the jitter representation of the initial timing data stream encoded and stored in a database.

22. An apparatus as in claim 19 with the means to enhance the jitter by a controlled amount of deliberate jitter.

23. An apparatus as in claim 22 with the means to enhance the jitter with a random number generator.

24. An apparatus as in claim 19 with the means to enhance jitter by a random amount of media enhanced jitter.

25. An apparatus as in claim 19 with the means to detect the timing variations of oriented magnetic structures and create a Jitter Signature number.

26. An apparatus as in claim 19 with the means to enhance the jitter by a predetermined percentage of deliberate jitter.

27. An apparatus as in claim 19 with the means to modulate the jitter to a pre-selected pattern.

28. A method of securing magnetically encoded data by a means of detecting random variations in the timing of magnetically encoded data combined with the random effect of the magnetic media comprising:

a means for deriving the timing variations of the data by reading encoded data and storing the initial timing data stream by representation as the initial Jitter Signature number at the end of the data in the trailing zeros of the magnetically encoded data;

comparing the jitter pattern of the timing data stream of a subsequent reading of the magnetically encoded data to the initial timing data stream generated from the stored initial Jitter Signature number; and

a means for indicating the results of the comparison.

29. A method of securing magnetically encoded data by a means of using random variations in the timing of encoded data in combination with random varying effect of magnetic material comprising:

detecting by reading magnetically encoded data after encoding on magnetic computer tapes, disks, labels, tickets, fare cards, plastic cards, decrementing value cards,

magnetic striped documents, and magnetic materials;

storing the initial timing data stream by representation as the initial Jitter Signature number on the magnetic media;

comparing the timing data stream of any subsequent reading of the encoded data to the initial timing data stream generated from the stored initial Jitter Signature number; and

indicating the results of the comparison.