Varying segment sizes to increase security

Details Varying segment sizes to increase security Varying segment sizes to increase security

2006-02-28

2006-02-28

Mehta, Bhavesh M. (Department: 2625)

Image analysis

Applications

C380S201000, C713S176000

Reexamination Certificate

active

07006658

ABSTRACT:
A security system is configured to use a variable length encoding of a security identifier for segments of protected content material. In this system, a distinction is made between a “zero” information bit, and the “absence” of the information bit in a shorter information item. A conventional N-bit information encoding is encoded as a variable bit encoding, wherein the information encoding ranges from N−k bits to N+k bits. By distinguishing “zero” bits from “absent” bits, this variable bit encoding allows for 2N−k+2N−(k−1). . . +2N. . . +2N+(k−1)+2N+kpossible unique information values. Preferably, the number of bits used for each encoding of a segment of a data set is a random value, further adding to the complexity of creating a dictionary mapping for protected content material.

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