My task is to decrypt the following message, which was encrypted with a Vigenère cipher of length 4:
I used the Kasiski method but I must be doing something wrong.
The first charter in the sets of 4 the letters was B=3 and Q=3 but if B=E or Q=E then then shift is incorrect.
The second character in the set of 4 is C if C=E then it does not work,
The third character in the set of 4 is R if R=E then it does not work,
The fourth character in the set of 4 is E if E=E then it works.
How am I going to figure out the first-, second-, and third shift using the Kasiski method?
Keep in mind I will have to do this on paper during a timed test.
I know the code is
YODA and the plaintext is:
DO OR DO NOT THERE IS NO TRY JUDGE ME BY MY SIZE DO YOU RECKLESS IS HE NOW THINGS ARE WORSE