In that case, it looks like we're just back to:

Code:
cryptotext = plaintext + offset
if (cryptotext > 0xFF) cryptotext -= 0xFF


So a decoder should look like:

Code:
plaintext = cryptotext - offset
if (plaintext < 0) plaintext += 0xFF


Edited by wfaulk (24/10/2011 17:46)
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Bitt Faulk