Browse Prior Art Database

DISK FINGERPRINTING USING THE READBACK SIGNAL FOR DATA SECURITY IN A DISK DRIVE

IP.com Disclosure Number: IPCOM000013521D
Original Publication Date: 2000-Feb-01
Included in the Prior Art Database: 2003-Jun-18
Document File: 2 page(s) / 50K

Publishing Venue

IBM

Abstract

The invention solves the following problem: how to make data be accessible only from a particular disk drive and no other. For example, if a licensed operating system is installed on a particular disk drive or if there are sensitive data files, it may be necessary to prevent unauthorized copying and use. The invention uses a disk drive "fingerprint" that is unique. Because no two physical disk surfaces are exactly alike, the invention uses the topography of a disk surface as a fingerprint to govern access to certain data. The invention could be used to secure Internet transactions, for example.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 53% of the total text.

Page 1 of 2

  DISK FINGERPRINTING USING THE READBACK SIGNAL FOR DATA SECURITY IN A DISK DRIVE

    The invention solves the following problem: how to make data be accessible only from a particular disk drive and no other. For example, if a licensed operating system is installed on a particular disk drive or if there are sensitive data files, it may be necessary to prevent unauthorized copying and use. The invention uses a disk drive "fingerprint" that is unique. Because no two physical disk surfaces are exactly alike, the invention uses the topography of a disk surface as a fingerprint to govern access to certain data. The invention could be used to secure Internet transactions, for example.

An example of diskprints are shown in Figure 1. These signals were obtained from magnetoresistive (MR) playback heads in a disk drive. For the heads shown, the signals were obtained from the same relative region of each disk surface for each column. Plots in the left column are taken near the outer disk diameter and plots in the right column are taken near the inner disk diameter. One advantage of using the thermal portion of the readback signal from a head as opposed to the magnetic signal, is that the thermal signal is not sensitive to track offset . The magnetic signal is sensitive to offset , but could be compensated by averaging offsets. The thermal signals shown in Figure 1 are averaged over 20 successive disk revolutions in order to extract the repeatable part of the signal. These signals represent...