Cryptography 4. Consider a transposition cipher that needs to encrypt a message of length 15 using...
Cryptography
4. Consider a transposition cipher that needs to encrypt a message
of length 15 using [3, 1, 4, 5, 2] as the key.
a) (5 pts) Show the process of encryption using the matrix
representation of the key. You may pick any message of length 15 as
your choice.
b) (5 pts) Repeat Part (a) for the process of decryption. The
output of the decryption should be the original message.
Homework Answers
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Cryptography
4. Consider a transposition cipher that needs to encrypt a message
of length 15 using...
1. Encrypt the message howareyou using the affine cipher using the key (7,3). (a) What is...
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...
"Encode and decode a message using a substitution and transposition cipher." I'm not exactly sure what...
"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...
5. ENCRYPT following message using VIGENERE CIPHER a. attack at dawn; Key = SECRET b. no...
5. ENCRYPT following message using VIGENERE CIPHER a. attack at dawn; Key = SECRET b. no travel in april; Key = PANDEMIC
Computer science encryption please refer to the chart to help For the remaining questions, consider a...
Computer science encryption please refer to the chart to
help
For the remaining questions, consider a 4-bit block cipher, described in hexadecimal by the following table: Plaintext Ciphertext Plaintext Ciphertext 4 You can think of this as a simple substitution cipher for hexadecimal digits. The table itself serves as the "key" s (6 pts) For this question, you will perform encryption and 5. decryption using the same cipher described above, but in CBC mode. Recall that you can convert hexadecimal...
4. Suppose you wish to encrypt the message, M 42 using RSA encryption. Given a public...
4. Suppose you wish to encrypt the message, M 42 using RSA encryption. Given a public key where p- 23 and q-11 and the relative prime e- 7. Find n, and show all necessary steps to encrypt your message (42). (Hint: check p.411 of the text for information on public key RSA) (5 points)
Exercise: Execute the next cell to produce a message encrypted using the Hill cipher method [4]: ...
Hill cypher
Exercise: Execute the next cell to produce a message encrypted using the Hill cipher method [4]: cipher make_cipher cipher out [4]: 129, 41, 42, 75, 94, 103, 34, 43, 48, 44, 44, 64, 18, 23, 23, 80, 95, 116, 48, 48, 63, 46, 46, 66, 78, 87, 108, 61, 77, 85, 54, 66, 81, 70, 75·94, 58, 72, 87, 34, 50, 51, 86, 106, 120, 79,97, 116 58, 67, 83 The message starts with the word "CLASSIFIED use...
Some cryptography and a little computer security. You find an odd DeLorean parked around the corner....
Some cryptography and a little computer security. You find an odd DeLorean parked around the corner. Realizing that Doc Brown has left the keys in the ignition, you decide that a quick trip back to Rome in 40 BC is in order. A few mint condition coins, and possibly a picture of Vincengetorix will be highly remunerative. As usual, the car fails and you are stranded. All is not lost, Julius Caesar recruits you for his secret service as a...
Can i get Playfair Cipher for python 3 that encrypts a message and decrypts it, could...
Can i get Playfair Cipher for python 3 that encrypts a message and decrypts it, could you possibly make it as simple as you can without losing functionality. please include comments, that would help me better understand Example of PlayFair Cipher: https://en.wikipedia.org/wiki/Playfair_cipher The Playfair cipher uses a 5 by 5 table containing a key word or phrase. Memorization of the keyword and 4 simple rules was all that was required to create the 5 by 5 table and use the...
(d) Decrypt the ciphertext message LEWLYPLUJL PZ H NYLHA ALHJOLY that was encrypted with the shift cipher f(p) (p+7) mod 26. [10 points] (e) [Extra Credit - 5 points] Encrypt the message "BA"...
(d) Decrypt the ciphertext message LEWLYPLUJL PZ H NYLHA ALHJOLY that was encrypted with the shift cipher f(p) (p+7) mod 26. [10 points] (e) [Extra Credit - 5 points] Encrypt the message "BA" using the RSA cryptosystem with key (ne) = (35,5), where n = p . q 5-7 and ged(e, (p-1) 1)) (5, 24) 1. 6. [5 points each (a) Is 2 a primitive root of 11? (b) Find the discrete logarithm of 3 modulo 11 to the base...
Cryptography, the study of secret writing, has been around for a very long time, from simplistic...
Cryptography, the study of secret writing, has been around for a very long time, from simplistic techniques to sophisticated mathematical techniques. No matter what the form however, there are some underlying things that must be done – encrypt the message and decrypt the encoded message. One of the earliest and simplest methods ever used to encrypt and decrypt messages is called the Caesar cipher method, used by Julius Caesar during the Gallic war. According to this method, letters of the...
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...
5. ENCRYPT following message using VIGENERE CIPHER a. attack at dawn; Key = SECRET b. no travel in april; Key = PANDEMIC
Computer science encryption please refer to the chart to
help
For the remaining questions, consider a 4-bit block cipher, described in hexadecimal by the following table: Plaintext Ciphertext Plaintext Ciphertext 4 You can think of this as a simple substitution cipher for hexadecimal digits. The table itself serves as the "key" s (6 pts) For this question, you will perform encryption and 5. decryption using the same cipher described above, but in CBC mode. Recall that you can convert hexadecimal...
4. Suppose you wish to encrypt the message, M 42 using RSA encryption. Given a public key where p- 23 and q-11 and the relative prime e- 7. Find n, and show all necessary steps to encrypt your message (42). (Hint: check p.411 of the text for information on public key RSA) (5 points)
Hill cypher
Exercise: Execute the next cell to produce a message encrypted using the Hill cipher method [4]: cipher make_cipher cipher out [4]: 129, 41, 42, 75, 94, 103, 34, 43, 48, 44, 44, 64, 18, 23, 23, 80, 95, 116, 48, 48, 63, 46, 46, 66, 78, 87, 108, 61, 77, 85, 54, 66, 81, 70, 75·94, 58, 72, 87, 34, 50, 51, 86, 106, 120, 79,97, 116 58, 67, 83 The message starts with the word "CLASSIFIED use...
(d) Decrypt the ciphertext message LEWLYPLUJL PZ H NYLHA ALHJOLY that was encrypted with the shift cipher f(p) (p+7) mod 26. [10 points] (e) [Extra Credit - 5 points] Encrypt the message "BA" using the RSA cryptosystem with key (ne) = (35,5), where n = p . q 5-7 and ged(e, (p-1) 1)) (5, 24) 1. 6. [5 points each (a) Is 2 a primitive root of 11? (b) Find the discrete logarithm of 3 modulo 11 to the base...
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