Electrical computers and digital processing systems: support – Multiple computer communication using cryptography – Particular communication authentication technique
Reexamination Certificate
2005-11-01
2005-11-01
Caldwell, Andrew (Department: 2137)
Electrical computers and digital processing systems: support
Multiple computer communication using cryptography
Particular communication authentication technique
C705S075000, C705S057000, C380S201000
Reexamination Certificate
active
06961853
ABSTRACT:
A method of and an apparatus for implementing real-time transaction specific watermarking to generate a transaction specific digitally watermarked data file is described. The method comprises two stages. Prior to receiving (52; 102) a transaction request for the data file: the data file is divided (34; 84) into a plurality of sections; and a set of pre-calculated elementary watermarks is created (86). On receiving (52; 102) a transaction request for the supply of the data file: the method comprises calculating (56; 106) a transaction specific watermark; selecting (64; 114) pre-calculated elementary watermarks equivalent to constituent portions of the transaction specific watermark by comparing the constituent portions of the transaction specific watermark with the pre-calculated units of data; and constructing (66; 116, 118) a transaction specific watermarked data file by assembling the selected pre-calculated elementary watermarks together with corresponding ones of the plurality of sections.
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Caldwell Andrew
Hewlett--Packard Development Company, L.P.
Pyzocha Michael
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