Method for selective encryption within documents

Details Method for selective encryption within documents Method for selective encryption within documents

2003-10-23

2008-03-18

Peeso, Thomas R. (Department: 2132)

Electrical computers and digital processing systems: support

Multiple computer communication using cryptography

Protection at a particular protocol layer

C713S152000, C713S154000, C713S168000

Reexamination Certificate

active

07346769

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. 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. This process is similar to the existing word processor capability to highlight areas on a document and then assign rich text attributes, such as BOLD, ITALICS, etc., to those areas. 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.

REFERENCES:
patent: 5157763 (1992-10-01), Peters et al.
patent: 5212784 (1993-05-01), Sparks
patent: 5267313 (1993-11-01), Hirata
patent: 5673316 (1997-09-01), Auerbach et al.
patent: 6339825 (2002-01-01), Pensak et al.
patent: 6345256 (2002-02-01), Milsted et al.
patent: 6449721 (2002-09-01), Pensak et al.

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