hello; have you checked that your blowfish encryption/decryption are functioning correctly re: messages of different lengths? the reason i suggest this is that is is easy to use blowfish but different schemes have different methods of implementing the 'end block' problem; these can sometimes cause problems; at least they did when i implemented blowfish (:-)) to check if this is the case, just send a set of messages containing a consecutive range of bytes, and examine the results with od -c or something to ensure the implementor of blowfish has done his/her job properly. hoping this helps, kh.