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Given the below ciphertext which has been encrypted using substitution cipher, answer the following questions. UZQSOVUOHXMOPVGPOZPEVSGZWSZOPFPESXUDBMETSXAIZ VUEPHZHMDZSHZOWSFPAPPDTSVPQUZWYMXUZUHSX EPYEPOPDZSZUFPOMBZWPFUPZHMDJUDTMOHMQ a) Determine the frequency of repeating the following letters in the above ciphertext. P, Z, S,W Hint: The frequency of the letters 'F' and 'C' in the ciphertext (in percentages) are as follows: F: 3.33, C: 0.00 b) The figures below show the relative frequency of letters and top bigrams in English text. In the above ciphertext, the most common bigram is zw, which appears three times. In addition, notice the sequence zwSZ in the first line. We do not know that these four letters form a complete word, but if they do, it would be another hint. Find the equivalents of plain letters for the above letters. Letters Frequency 0.14 0.127 0.12- 0.10- 0.082 0.08 0.070 0.061 0.075 0.0671 0.06 0.0000.062 0.043 0.040 0.04 0.028 0.0220.020 10.024 0.02- 0.015 0.019 0.008 0.002 Jo 001 0.028 0.024 0.020 0.010 0.002 0.001 T U V W X Y Z Top Bigrams Frequency 0.030 0.0290 0.025 00248 0.020 0.0187 00173 00165 0.015 0013800135 00119001170011400113 0010800108 001040010100100 0.010 0.005 0 TH HE IN ER AN RE ES 'STON 'NDEN 'NT'ATED'EA TO Using this Playfair matrix: M F H I/J K U N 0 P Q Z V W X Y E L A R G D S B Encrypt this message: MUST SEE YOU OVER CADOGAN WEST COMING AT ONCE Given the below ciphertext which has been encrypted using substitution cipher, answer the following questions. UZQSOVUOHXMOPVGPOZPEVSGZWSZOPFPESXUDBMETSXAIZ VUEPHZHMDZSHZOWSFPAPPDTSVPQUZWYMXUZUHSX EPYEPOPDZSZUFPOMBZWPFUPZHMDJUDTMOHMQ a) Determine the frequency of repeating the following letters in the above ciphertext. P, Z, S,W Hint: The frequency of the letters 'F' and 'C' in the ciphertext (in percentages) are as follows: F: 3.33, C: 0.00 b) The figures below show the relative frequency of letters and top bigrams in English text. In the above ciphertext, the most common bigram is zw, which appears three times. In addition, notice the sequence zwSZ in the first line. We do not know that these four letters form a complete word, but if they do, it would be another hint. Find the equivalents of plain letters for the above letters. Letters Frequency 0.14 0.127 0.12- 0.10- 0.082 0.08 0.070 0.061 0.075 0.0671 0.06 0.0000.062 0.043 0.040 0.04 0.028 0.0220.020 10.024 0.02- 0.015 0.019 0.008 0.002 Jo 001 0.028 0.024 0.020 0.010 0.002 0.001 T U V W X Y Z Top Bigrams Frequency 0.030 0.0290 0.025 00248 0.020 0.0187 00173 00165 0.015 0013800135 00119001170011400113 0010800108 001040010100100 0.010 0.005 0 TH HE IN ER AN RE ES 'STON 'NDEN 'NT'ATED'EA TO Using this Playfair matrix: M F H I/J K U N 0 P Q Z V W X Y E L A R G D S B Encrypt this message: MUST SEE YOU OVER CADOGAN WEST COMING AT ONCE
