However there are very few two letter nouns, the most common of which is 'ox', which could make sense if this is a cipher about farming (remember context is king), however we have already assigned the 'o'. The implication is that as GF follows 'the' it has to be a noun. The phrase 'the GF to the' is slightly jarring. We now have several options of what to do next - teCCBooBe looks like a good option to explore, however let's first deal with something that doesn't make sense. This theory seems more likely as we can now see the word 'to' - English's third most popular word - has appeared. UeGWeFLEDoYeWeFUeVTE the GF to the MoWtBoUteCCBooBe If we assume that the N has to be one of the popular vowels, this would mean it was highly likely that N is 'o'. Therefore it's highly likely the double N comes within the same word. Both 'a ?e', 'i ?e' are possible but rely on the prior word ending with either 'a' or 'i' respectively. Or they could be 'a ?e', 'i ?e' or 'o ?e'. It's possible that one of those letters comes at the end of one word and the next comes at the beginning of another, however this would mean - assuming we're right about the 'e' - that the final word was either a?e, i?e or o?e - none of which seem likely. Towards the end of the phrase we see a double N. It's likely that N is one of the other popular vowels - A, I or O. The next most popular letter in the phrase is N. Remember at this stage we're still guessing - we may need to go back and try different things later. UeGWeFLEDNYeWeFUeVTE the GFtN the MNWtBNUteCCBNNBe Also R appears 5 times, while K only appears in these two occurrences, which ties in with our earliest stats. We can see that in our string R and K come before A twice. We also know from our list of words that 'e' is often preceded by 'th'. UeGWeFLEDNYeWeFUeVTERKeGFRNRKeMNWRBNUReCCBNNBe We can start by substituting the most common letter in the phrase, A, with the most common letter in the alphabet, 'e'. These 10 words make up more than 22% of all words used in written English, meaning that it's highly likely any phrase will contain one or more of these words. In the example, the letters appear this often: The best way to start is by looking at the frequency of letters. UAGWAFLEDNYAWAFUAVTERKAGFRNRKAMNWRBNURACCBNNBA
#Substitution cipher solver code#
We're not always fortunate enough to have a code with spaces and apostrophes. Ultimately, when solving a substitution cipher - or any code - you need to combine these techniques with your own logic and powers of deduction. Therefore we must take into account the context in which we found the code - did the person that wrote it have an interest in hats or bats? Did they own a cat or a rat? Were they researching fats or making mats? This brings us to the final part of decoding - as the message is so short there's nothing else to go on. Therefore we know the final missing letter is 'b', 'c', 'f', 'h', 'm' or 'r'. Nor can it begin with any letters we have already discovered. It can't begin with a vowel as the word before would be 'an' rather than 'a'. All the words which are verbs don't make grammatical sense (e.g. There are 20 different three letter words which end with 'at'. Therefore ?T's A ?AT is the likely solution.Īs we have seen from the list of words earlier, the first word must be it's. There aren't any common words which are three letters long and end with 'ae'. Therefore the message must be one of these: It also doesn't make sense that he'd or we'd would be followed by the word a. Therefore it is unlikely that he's, it's, he'd it'd or we'd be followed by the word I. Now it makes sense to assume that this phrase would makes sense grammatically. Therefore the message could be any of the following 8 options: This means it's likely that Z = E or T, L = S or D and Q = A or I.
The most likely options for the first word are: he's, it's, he'd, it'd and we'd. You can begin by guessing that any single letter words are either A or I.Īpostrophes are also helpful, because we know that singe letters after apostrophes are most likely to be, in order: S, T, D or M (double letters are most likely to be LL, RE or VE). This implies three words (although some codes put in spaces randomly to throw you off).
There are lots of useful pieces of information that can help us to do this.įirstly, we can look to see if the text written in one long string, or if are there spaces between letters indicating words. The best way to imagine this is by looking at an example. To decode a substitution cipher we need to work backwards.
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