Data processing: database and file management or data structures – Database and file access – Search engines
Reexamination Certificate
2011-07-12
2011-07-12
Breene, John (Department: 2162)
Data processing: database and file management or data structures
Database and file access
Search engines
C707S750000, C707S758000, C707S770000, C715S209000, C715S234000, C715S258000
Reexamination Certificate
active
07979413
ABSTRACT:
In accordance with an aspect of the invention, a method and system are disclosed for constructing an embedded signature in order to facilitate post-facto detection of leakage of sensitive data. The leakage detection mechanism involves: 1) identifying at least one set of words in an electronic document containing sensitive data, the set of words having a low frequency of occurrence in a first collection of electronic documents; and, 2) transmitting a query to search a second collection of electronic documents for any electronic document that contains the set of words having a low frequency of occurrence. This leakage detection mechanism has at least the following advantages: a) it is tamper-resistant; b) it avoids the need to add a watermark to the sensitive data, c) it can be used to locate the sensitive data even if the leakage occurred before the embedded signature was ever identified; and, d) it can be used to detect an embedded signature regardless of whether the data is being presented statically or dynamically.
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Krishnamurthy Balachander
Kumar Saurabh
Subramanian Lakshminarayanan
AT&T Intellectual Property l, L.P.
Breene John
Ly Anh
New York University
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