17 Dec
2003
17 Dec
'03
11:17 p.m.
Does DES (or name your favorite encryption algorithm) produce as output all possible cyphertexts of length L, given all possible conbinations of keys and plaintexts of length L?
Choose any cyphertext and a random key and decrypt the cyphertext with that key. Now you have a key and a plaintext which produce this cyphertext. Hadmut