The title seems little crazy, but I think that it is possible. Just think about it. If you create text file like this:
You get this checksum:
But if you change any letter like this:
You get this:
That means, that if I change any letter I always get another checksum, so there must be any way to get source file back.
My question is: Is there any way to get source file back without creating all possible combinations and checking checksum?