You can do first level obtusification simply (and without alot of processor cost) by doing a simple XOR on all the data in the packets.
foreach byte i in buffer { buf = buf XOR key }
the same code is used to 'decrypt it' (since xor is a reversable function)
Do it 4 bytes wide (or maybe wider using SIMD instructions) XOR with either a static or a rotating key system.
Only a little more complex would be a mutated key for each session or other data value sent at login)....
This would give a minimal protection from those too lazy or inexperienced to look at your programs code and decompile it and find the algorythm used.
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