Electrical computers and digital processing systems: support – Data processing protection using cryptography – By stored data protection
Reexamination Certificate
2011-03-29
2011-03-29
Henning, Matthew T (Department: 2491)
Electrical computers and digital processing systems: support
Data processing protection using cryptography
By stored data protection
C713S166000, C380S044000, C380S045000, C380S260000
Reexamination Certificate
active
07917771
ABSTRACT:
The present invention allows the user (author or creator) of a document to specify that certain portions of a document be selected for encryption while other portions of the document remain displayed as created. In addition, each encrypted section could have multiple encryption keys such that some viewers can review certain parts of the document while other viewers will not have that same access. The user could employ a standard word processing editor technique to highlight (or swipe) portions of a document that the user desires to be encrypted. The highlighted portion would then be ‘tagged’ with a surrounding attribute indicating to the word processor that this highlighted portion of the document is to be encrypted. The highlighted sections would also have encryption keys associated with the highlighted and encrypted section. Any one of the encryption keys for that section would decrypt that section. With proper authorization, any encrypted portion of a document would be displayed as part of the document. Without proper authorization, the display of the document would only contain the unencrypted portions of the document.
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Berstis Viktors
Forlenza Randolph Michael
Henning Matthew T
International Business Machines - Corporation
Schmeiser Olsen & Watts
Steinberg William H.
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