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Message: <blockquote data-quote="infernocus" data-source="post: 30895836" data-attributes="member: 588217">Decoding technique for any substitution cipher, without knowing the substitution algorithm.- Find single letter words, those are "a" or "I"- Then do a frequency analysis. frequency of each letter in English(or any language), is kind of a constant. So you can find a large paragraph from a book or story, and calculate the frequency of each letter, then calculate the frequency of each letter in the cipher text, then do a match. It won't be a 100% match but you should be able to decode "a", "e" (and guesses for few more letters) with this. Then combine this with first step, you can guess a, e, i- Then there are few techniques you can follow, you can look for 3 letter words and try to find "The", then you can look for repeating patterns like "ING", "ION" etc with some guess work. Then you can do a simple guess and find rest.- This gets easier and easier as you find more and more letters.Once you do about 50% of the deciphering, then you can simply fill the words by looking at them.With above logic,single letter words areb and fby looking at the frequency of those letters (B is heavily used in the middle of sentences as well)b -> af -> Ithen by looking at three letter words, the most common three letter words is "Tgd", and its been used in the start of sentences as well, so it must be "The"</blockquote>

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