Fragile watermarks

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2005-10-17

2010-06-01

Ali, Mohammad (Department: 2158)

Data processing: database and file management or data structures

Data integrity

C713S176000

Reexamination Certificate

active

07730037

ABSTRACT:
Disclosed is a fragile watermarking scheme for detecting and localizing malicious alterations made to a database relation with categorical attributes without introducing distortions to cover data. A watermark for a tuple group may be inserted by selectively switching the position of tuples in tuple pairs using a tuple hash associated with each tuple in the tuple pair; and a corresponding bit in a watermark derived from the tuple group using a embedding key, a primary key and hash functions.

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