Decrypt the following ciphertext using the double transposition cipher using a matrix of 9 rows and 8 columns.
TAWETNSHENGAMINEQTNSUIOEFHYTUENLIUVOFHAYETCNSENEETSFRHIOOVOAUEGHENHUFDTO
Hint: The first two words in the plaintext are “IF” and “YOU”.
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Decrypt the following ciphertext using the double transposition cipher using a matrix of 9 rows and...
Substitution Cipher Ke 1. Decipher the following ciphertext using the substitution cipher key shown above: (4 points) Ciphertext: DOVMYWOJAYJMYWZBAOXOADY!U I Plaintext: The following information was extracted from The BLACK Chamber's Pigpen Cipher page. The content is available at https:/simonsingh net The_Black Chamber'pigpen html. "The Pigpen Cipher was used by Freemasons in the l8th Century to keep their records private. The cipher does not substitute one letter for another; rather it substitutes each letter for a symbol The aiphabet is written...
Please decrypt the message step by step and verify the inverse
matrix.
The ciphertext “FWJDSPLQTZNTUHD” was obtained using a Hill cipher with the matrix (11 11 01 M = 5 1 15 (mod 26) | 16 5 11 Verify that the inverse matrix is / 8 7 7 7 8 7 7 M-1 = | 11 19 19 ) = | 11 –7 –7 (mod 26) 17 19 12 17 -7 12 and decrypt the message.
Using the Hill cipher, decrypt the ciphertext, “BOHBFBTLTTNKKC” with the key, 1-1 3 K= Li -2] Show all steps in the Hill method.
Using a ROT5 cipher encrypt the following plaintext. Prove your answer by showing the steps for both the encryption and decryption. (20 points) Meet at the baseball field at three oclock 2. Using a ROT3 cipher decrypt the following ciphertext. WKHF RUYH WWHL VUHG
Part 3: Transposition Ciphers #can't use ord or chr functions You must implement three transposition ciphers (the "backwards" cipher, the Rail Fence cipher, and the Column Transposition cipher) where the ciphertext is created via an altered presentation of the plaintext. The algorithm for each is detailed in the function descriptions in this section. (13 points) def backwards_cipher(plaintext, key): • Parameter(s): plaintext ----- a string; the message to be encrypted key ----- an integer; the number to control this cipher •...
Alice has at her disposal 3 encryption algorithms, they are: a transposition cipher, a monoalphabetic substitution cipher and a polyalphabetic substitution cipher. She encrypts the following plaintext: Hello World For each of the following ciphertexts write down which type of cipher, or ciphers, Alice could have used to generate it. Explain your reasoning. In addition if you believe that more than one cipher could have generated the ciphertext explain which one is the most likely. (a) ollerldWHO (3 marks) (b)...
1. Encrypt the message howareyou using the affine cipher using the key (7,3). (a) What is the resulting ciphertext? (b) What is the decryption function you can use to decipher each ciphertext character? (c) Use your decryption function to decrypt the message to confirm you get the ciphertext back. 2. Use the ADFGX cipher using the grid below and the keyword "place" to encrypt the plaintext "brandenburggate". FREE GX (a) (b) What is the resulting ciphertext? How does the ADFGC...
Question) Write a decryption function decryp_scytale(ctext, key) in PYTHON that would decrypt any ciphertext produced through the scytale cipher scheme using a given key. Note: the key refers to the diameter of the rod. It represents the number of characters which can be written in the one of the rounds around the rod (think of number of rows in a table). Also, remember that it is assumed that the rod can have an infinite length, i.e. there is no limit...
a.
b.
c. What does the ciphertext ONL decode to with the modular
inverse matrix from Question b?
d. We use an encoded text using a Caesar cipher. The ciphertext
was intercepted which is: THUBYLDH. What is the word? How did you
work this out?
Encode the uppercase letters of the English alphabet as A-0, B-1, C-2 and so on. Encrypt the word BUG with the block cipher matrix 16 4 11] 10 3 2 using modulo arithmetic with modulus...
"Encode and decode a message using a substitution and transposition cipher." I'm not exactly sure what a substitution and transposition cipher are exactly, but I "think" it has to do with something like this: I want to encode then decode the string: "HELLO". I have: c(H) = (8 + 4)mod26 == 12mod26 == 12 H = 12 == L c(E) = (5+4)mod26 E = 9 == I c(L) = (12+4)mod26 L = 16 == P x2 c(O) = (15+4)mod26 O...