Dudes: As promised, there's now a PIC17 version of the TEA code on my web page... It occupies only 192 words of ROM (versus 271 for the PIC16 version) and encrypts/decrypts over 12K bytes per second at 33 MHz. If you want it, point your web browser to: http://www.geocities.com/SiliconValley/2499 and click on the "Code" link. -Andy === Andrew Warren - fastfwd@ix.netcom.com === Fast Forward Engineering - Vista, California === http://www.geocities.com/SiliconValley/2499 (personal) === http://www.netcom.com/~fastfwd (business)