You forgot about another point: how to protect your design from illegal copy!? Pirate will never try to understand how your design work - he will just copy your bitstream file from on-board EEPROM and that's all!
You are right, i have never thought about it.
tahiti said:And, as far as I know 3DES can be cr@cked, if you have extremely large computing power.
hitower said:Ordinary DES can be cracked in hours using specialized processors (they can be built for example on Xilinx