if your talking about encoding as in base64 etc
just goto
http://www.google.com "base64 tutorials" "base64 encoding download" and hey joe what do u know you have tutorials and possible programs to do your bidding if your talking about encryption just look up ras/aes/des/blowfish in any particular order
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The wise make mistakes, the fools repeat them
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When you have eliminated the impossible, that which remains, however improbable, must be the truth