Re: Screening Outgoing Mail for Content

Thomas Schiavinato (tschiaviadvsys.com)
Wed, 5 Aug 1998 11:26:07 -0400 (EDT)

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According to Perry E. Metzger:
> Users smart enough to use a scanner can send out GIF's of sensitive
> documents without you being able to detect it via automation.

"Sufficiently determined" detectors can decode common graphic formats
and pump them through OCR software. Even designs typically have
textual labels you can key on.

However, you are right. "Smart" users can employ steganographic
techniques to hide data in the images.

Regards,
Tom

-- 
Tom Schiavinato                            Advanced Systems Consulting Inc.
Senior Systems Consultant                                     Marlton, N.J.

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