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Are you using single or double key cyphers though? In most situations the transmission in all reality would be using double key incryption, two keys are created for one direction of transmission, a public and private key, only one can encrypt and only the other can decrypt.
While if you are using a single key algorith a simple XOR based encryption will work. I would imaging you want a double key system though since XOR based encryption is really simple in concept.
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