Instructions: In this task, you're given a sentence and your task is to generate a simplified sentence that focuses on lexical paraphrasing from the original sentence given in the input.
Input: background des uses a 56-bit key , meaning that there are 256 possible keys under which a message can be encrypted.
Output:
background des uses a 56-bit key , meaning that there are 256 possible keys which can be used to encode a message.