Reply To: What is a Porta cipher?

[madness]

Here’s how to fake a Porta cipher with a Beaufort cipher:

Take your plaintext P.
Encrypt P with a monoalphabetic substitution cipher with key AOCQESGUIWKYMZLXJVHTFRDPBN.
Encrypt the result with a Beaufort, after changing the key according to the table below.
Encrypt the result with a monoalphabetic substitution cipher with key AYCWEUGSIQKOMZBXDVFTHRJPLN.
The result is your ciphertext C, which can be decrypted as a Porta.

Porta, American      Porta, British       Beaufort
A,B                  A,B                  Z
C,D                  Y,Z                  L
E,F                  W,X                  X
G,H                  U,V                  J
I,J                  S,T                  V
K,L                  Q,R                  H
M,N                  O,P                  T
O,P                  M,N                  F
Q,R                  K,L                  R
S,T                  I,J                  D
U,V                  G,H                  P
W,X                  E,F                  B
Y,Z                  C,D                  N