original: background des uses a 56-bit key , meaning that there are 256 possible keys under which a message can be encrypted .
simplifications: background des uses a 56-bit key , meaning that there are 256 possible keys which can be used to encode a message . background des uses a 56-bit key which means that there are 256 possible keys that can be used to code a message . background des uses a 56-bit key , which means that there are 256 keys that can be use to ecrypt the message . 1 . background des uses a 56-bit key , meaning that there are 256 possible keys under which a message can be encrypted . background des uses a 56-bit key , meaning that there are 256 keys under which a message can be encrypted . background des uses a 56-bit key , so a message can be encrypted with any of 256 keys . background des uses a 56-bit key , meaning there are 256 possible keys for message encryption . background des uses a 56-bit key , meaning that there are 256 possible keys . a message can be encrypted .