Vigenere with multiple encryption

Asked Mar 15 '19 at 11:50

Active Mar 15 '19 at 14:43

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I have a school project about cryptography. The question is the following (will only give a short phrase as example, just want to know the method). A text has been encoded with Vigenere 2 times. The ciphertext is FXFCKDKFCLMHOSPERVBOPDJ (it's Dutch btw, you won't really get plausible words because I cut it off). It has first been encoded with a cipher of 3 letters, and then with a cipher of 2 letters. The first letter of the 2nd cipher is an O.

edited Mar 15 '19 at 14:43

kelalaka

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asked Mar 15 '19 at 11:50

Jimmy033

Welcome to CryptoSE. Please provide some additional information about what you have tried so far to solve it and where you're stuck, else this question will likely be closed. – AleksanderCH Mar 15 '19 at 12:05
One thing you can try is to consider the two encryptions as one by gathering them in a single 6 letters key. If the first key is ABC and the second one GO, then the 6 letters key will be ABCABC+GOGOGO – Bissi Mar 15 '19 at 13:43
Possible duplicate of Vigenere ciphertext encrypted with another vigenere cipher. Note: this is one of the questions – kelalaka Mar 15 '19 at 14:45
@Bissi Shouldn't that be ABCABC+OGOGOG? – Lothar Mar 15 '19 at 18:55

Vigenere with multiple encryption

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