(a) The ciphertext ITFO was encrypted by a Hill cipher with a 2×2 matrix. The plaintext...
(a) The ciphertext ITFO was encrypted by a Hill cipher with a 2×2 matrix. The plaintext is dont. Find the encryption matrix.
(b) Suppose the ciphertext is ITFE and the plaintext is still dont. Find the encryption matrix. Note that the second column of the matrix is changed. What does it mean? Is it a good or a bad property of a cipher. Discuss.
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(a) The ciphertext ITFO was encrypted by a Hill cipher with a
2×2 matrix. The plaintext...
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...
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...
Polyalphabetic Ciphers Suppose the following ciphertext was encrypted using Vignenere cipher with key size equal to...
Polyalphabetic Ciphers Suppose the following ciphertext was encrypted using Vignenere cipher with key size equal to 2. Try to find the two letters that were used in the encryption. SVSMHSCXGROFSLSOBDVOICIKZWSMVKBSGWPIKRWMVWCNSBBBSZFOGOBDODWFSNSWCMFKQIV KGYDOFKHOROZOQDWYBCAKMPWVZYTPWMSCWXHRSVSQWCZKHEFOGYAOHSAOGSBDVOSHSMID WFSKBNXERSQSOBMKBNTYFBSQWYBKZKBNZYQKZQCFSBBWSXHDVSGZFYQOGCWCOVGYICSNWXAK BICDVOFZFSJKHOOXRLICWXSCGYFQOXWJODWYBCTBCWQVILGDCFCVIXHKFIOCGYQSODWYBCOXR MCBDYFKHSCXGDVOIXWFSBGKZEGOCPSVSMHSCXGKGKHYCVTYFCSVSMHSBQFODBSCSXHKHSJOGSB WCNSBBBSZFOGOBDODWFSNSWCMFKQSSCWCWXQYBDFKGDKSHRHRSZFKQDWMSSBDVOROAYQB ODWMOBQRSDMZSKBMWOBDODVOBCKRSBSDVOSVSMHSCXGGSBSXCDICSNKOFOQYBCWNSBSNO XCVWQOBQRWMWXGDWDIDWYBKBNAYGDDYZSHSQKZYTPWMSCKOFOTSZVSNICWXUCCBHSHSCX OVGYYXCGBKGKZVCDAOBDPIKRWMVYTPWMSRCVROFCKOFOQRCCSXPIZYH
Eve captures Bob’s Hill cipher machine, which uses a 2 by 2 matrix M mod 26. She tries a chosen plaintext attack. She fi...
Eve captures Bob’s Hill cipher machine, which uses a 2 by 2 matrix M mod 26. She tries a chosen plaintext attack. She finds that the plaintext “ba” encrypts to “HC” and the plaintext “zz” encrypts to “GT”. What is the matrix M.
2. Use the 3-bit block cipher in the table below to answer the following. Suppose the...
2. Use the 3-bit block cipher in the table below to answer the following. Suppose the (a) Use the block cipher without cipher-block chaining (CBC) to encrypt the message (b) Suppose Trudy intercepts the ciphertext. Further suppose she knows that the text was plaintext is m 011011011. What is the resulting ciphertext? encrypted with a 3-bit block cipher without CBC, but she does not know the specific cipher. What can she determine about the original message? (c) Now use the...
Problem 1 Consider the 3-bit block cipher in slide 8-18. Suppose the plaintext is 101101101. If...
Problem 1 Consider the 3-bit block cipher in slide 8-18. Suppose the plaintext is 101101101. If CBC is used with initial vector 110, what will be the resulting ciphertext? Show work, not just the final answer. Problem 2 Consider RSA with public key (n, e) and private key (n, d) where n = 35, e = 5, and d = 29. What is the encryption of m = 34? What is the decryption of c = 34? Show calculations, not...
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...
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...
a. b. c. What does the ciphertext ONL decode to with the modular inverse matrix from Question b? d. We use an encoded...
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...
Alice has at her disposal 3 encryption algorithms, they are: a transposition cipher, a monoalphabetic substitution...
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)...
the w 2. This problem explores the use of a one-time pad version of t In...
the w 2. This problem explores the use of a one-time pad version of t In this scheme, the key is a stream of random numbers between 0 and example, if the key is 3 19 5..., then the first letter of plaintext is encrypted with a shift of 3 letters, the second with a shift of 19 letters, the third with a shift of 5 letters, and so on. a. Encrypt the plaintext sendmoremoney with the key stream 9...
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...
2. Use the 3-bit block cipher in the table below to answer the following. Suppose the (a) Use the block cipher without cipher-block chaining (CBC) to encrypt the message (b) Suppose Trudy intercepts the ciphertext. Further suppose she knows that the text was plaintext is m 011011011. What is the resulting ciphertext? encrypted with a 3-bit block cipher without CBC, but she does not know the specific cipher. What can she determine about the original message? (c) Now use 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...
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...
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...
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)...
the w 2. This problem explores the use of a one-time pad version of t In this scheme, the key is a stream of random numbers between 0 and example, if the key is 3 19 5..., then the first letter of plaintext is encrypted with a shift of 3 letters, the second with a shift of 19 letters, the third with a shift of 5 letters, and so on. a. Encrypt the plaintext sendmoremoney with the key stream 9...
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