- This topic has 3 replies, 3 voices, and was last updated 1 month, 3 weeks ago by madness.
1st December 2022 at 10:25 am #87411madnessParticipant
The Porta cipher is a Quagmire 4, and I can prove it.5th December 2022 at 12:08 pm #87426ADecipherParticipant
Which challenge is the Porta Cipher?5th December 2022 at 3:46 pm #87450madnessParticipant
@ADecipher, NCC 2011 6B.
But that’s not what is the amazing thing.6th December 2022 at 5:47 pm #87463f6exbParticipant
“The Porta cipher is a Quagmire 4, and I can prove it.”
I have seen the paper, but I haven’t read it yet and I think I won’t understand anything.11th December 2022 at 5:50 pm #87535madnessParticipant
OK, well, if you make a Q4 with these alphabet keys
and translate the shift key according to this table,
then encryption and decryption are the same as the Porta.
Porta, American Porta, British Q4 A,B A,B N C,D Y,Z O E,F W,X P G,H U,V Q I,J S,T R K,L Q,R S M,N O,P T O,P M,N U Q,R K,L V S,T I,J W U,V G,H X W,X E,F Y Y,Z C,D Z23rd December 2022 at 11:21 am #87709madnessParticipant
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
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