Electrical computers and digital processing systems: support – Multiple computer communication using cryptography – Particular communication authentication technique
Reexamination Certificate
2006-10-03
2006-10-03
Bruce, David V. (Department: 2191)
Electrical computers and digital processing systems: support
Multiple computer communication using cryptography
Particular communication authentication technique
C713S180000, C380S028000
Reexamination Certificate
active
07117367
ABSTRACT:
A method of authenticating a text document with links to a plurality of files by modifying at least a selected attribute of invisible characters on a plurality of inter-word intervals of the text document, this method comprising the steps of computing (step10) a one-way hash function of each file in order to obtain a hash value composed of a subset of hash digits for each one, encoding (step16) each subset of a plurality of subsets of space characters in the document by replacing in each subset of space characters, the value of the selected attribute for each space character by a corresponding encoded hash digit of each subset of hash digits corresponding to each file, computing (step18) the electronic signature of the encoded text document by using a public-key algorithm composed of a subset of signature digits, and encoding (step20) another subset of space characters in the encoded document by replacing the value of the selected attribute for each space character by a corresponding encoded signature digit.
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Bruce David V.
Schmeiser Olsen & Watts
Shan April
Steinberg William H.
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