simple substitution cipher the simple substitution cipher substitutes one letter for another since there are possible substitutions for the letter possible substitutions for for cand so onthe total number of possible keys is or , , , , , , , , keysthat' far too many keys for even supercomputer to brute forceso the code-breaking method used in project "caesar hacker,can' be used against the simple cipher unfortunatelydevious attackers can take advantage of known weakness to break the code if you' like to learn more about ciphers and code breakingyou can read my book cracking codes with python (no starch press crackingcodes/