Assignment Task :

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 26 character alphabet, non-alphabet characters such as spaces and punctuation have been removed. Text begins at the start of a sentence. 
1. The Hill cipher is polygraphic, with block size m. For m = 2, explain how a known-plaintext attack is performed, and how much known plaintext is required for the attack to succeed. 
2. For a ciphertext-alone attack on a Hill cipher, some plaintext must be guessed. Assuming the plaintext is in English, list some common digrams. Justify your choice of items. 
3. The position of a common plaintext word within a message may be unknown, so many positions may be tested for a common word, in a process called ‘crib dragging’. Given the knowledge that your plaintext contains the word about, apply crib dragging to obtain the encryption key matrix 1. 
4. Compute the corresponding decryption matrix.

5. Provide the plaintext corresponding to the ciphertext you were given, including appropriate punctuation.
 
 26 character alphabet, non-alphabet characters such as spaces and punctuation have been removed. Text begins at the start of a sentence, but may end mid-word. 
1. Provide the output of Kasiski’s Test for factors up to 20. 
2. Refer to the output of Kasiski’s Test and identify a probable key length. 
3. Describe the process involved in breaking the Vigenere cipher once the key length is determined.

4. Apply this process to determine the key used with the Vigenere cipher. Clearly explain how you obtained the key. 
5. Provide the plaintext corresponding to the ciphertext you were given, including appropriate punctuation.
 

 

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  • Posted on : January 09th, 2018

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