Originally posted by moteutsch Attempting to get this thread going is futile. What will people post, ROT13 ciphers? Fairground ciphers? Come on. Besides, there are no good encryption methods that do not require a key.
ROT13 ciphers?!?! Is there more than 1?
Lets presume the Original Poster intended simple substitution cyphers to be cracked by analysis and logic. (ie look for single letters;a or I common combinations; the, and)
These do not need a 'key'to crack .... just time on your hands.