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Delastelle Cipher

ID: 530921 score:
0

The Delastelle cipher (or Trifid cipher) uses substitution with transposition and fractionation. Create the following ciphers for a key of "EPSDUCVWYM.ZLKXNBTFGORIJHAQ":

Plain textDelastelle CipherResult
funny
encrypt

Example

An example key is:

EPSDUCVWYM.ZLKXNBTFGORIJHAQ

We then make three squares from this:

                              
square 1   square 2   square 3   
                                 
  1 2 3      1 2 3      1 2 3    
1 E P S    1 M . Z    1 F G O    
2 D U C    2 L K X    2 R I J    
3 V W Y    3 N B T    3 H A Q    

If we take a plain text message of "THIS IS A TEST", we locate the text in the squares defined above:

THIS IS A TEST
--------------
T - 233
H - 331
I - 322
S - 113
I - 322
S - 113
A - 332
T - 233
E - 111
S - 113
T - 233

Next we would order as:

THISISATEST
-----------
23333132211
33221133322
33111113233

And we would read the code in a horizontal way to give:

233 333 321 321 311 111 331 233 232 123 123

And then substitute back the letters on the grid:

233 333 321 321 311 111 331 233 232 123 123
T   Q   R   R   F   E   H   T   B   C   C