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The GIF option I mentioned allows a widely disseminated image file to contain about 32 KB in just the LSBs of a 512 x 512 x 8-bit gray scale image. A color image could easily hold three times more (LSBs in each color channel). And some GIFs are much larger than 512 on a side.
IT should be trival to include date into GIFs (or most any other non-lossy formats) using the ppmplus library. giftoppm Image.gif | ppmInsertData data.pgp | ppmtogif > Image2.gif where ppmInsertData is a program that modifies the data stream using the file data.pgp as the crypt data source to extract just a command simular to: ppmExtractData < Image2.gif > data.pgp for sound file it would just as easy (in fact I am almost tempted to write some demo code but I have more email to attend to :-) -Pete -----BEGIN PGP SIGNATURE----- Version: 2.2 iQBFAgUBK6Aoxchmn7GUWLLFAQFSRQF+LvzpcW2fx/+FFklWI4RtW27E2GuWbfJn nun4KJ1YAzsf/lwxF/KcaGeGq6NwS6AP =vcGK -----END PGP SIGNATURE-----