You work at a police department, and are currently investigating a serial killer who is taunting police with encrypted letters. He has promised three extremely deadly attacks still to come, and has sent 3 letters to the police that include the dates of the next three attacks.
First Letter
C D R Q F A T I U Q V I H K T J R
W O I Q V J O M G H B V W Z K H Q
C O Q V K Y L M E H P V E K E M F
O C F K C H T S M U Z E S B I V W
Second Letter
C D U A R P D D E T W B P J Z G F I
E L L U Y O W P M S L E L F X H S L
N E T M Y L O O I D V S U R U P O J
H A R O S N O Q O Q C T K V A W R P T
Third Letter
C G V I W G U C D L M E Q S
E D B O L X Z M X M J Y L Y
T H C G U C I D B P W Q T I
Z H I D I G O G J B Y A X O
W T Q H S L N A K D A Q K Y
The police profilers have come up with some details they know about the killer that might help you, but they need you to decrypt the letters to figure out the dates of the next three attacks.
- The killer is not extremely intelligent; the cipher he is using is probably his own twist on a simple cipher.
- The killer calls himself "The Enigma" and will always include the name somewhere in his letters.
- The killer likes repetition; the content in the letters will likely be very similar if not exactly the same except for the date.
- The killer will likely use a similar cipher for each letter, just modifying it slightly to make each letter harder to decode than the last.
- The first time the killer does anything, he keeps it very straight forward. The profilers say the first character in each letter will most likely be unencrypted.
- The formatting of the letters is not likely to be important. The killer likes symmetry and just opted to make each line roughly the same number of letters long.
So, what are the three dates of the next attacks?