1) Given the below ciphertext which has been encrypted using substitution cipher, answer the following questions UZQSOVUOHXMOPVGPOZPEVSGZWSZOPFPESXUDBMETSKAIZ VUEPHZHMDZSHZOWSFPAPPDTSVPQUZWYMXUZUHSX EPYEPOPDZSZUFPOMBZWPFUPZHMDJUDTMOHMQ a) Determine the frequency of repeating the following letters in the above ciphertext. P, Z, S, 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 zusz 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 014 12 0.12- 0.10- 0.091 0.00 0001 0.000 006- 004- 2040 0040 COR od 2.000.000 000- 0.024 0.000 0- 0.000 0.00 neon J K L M N O P Q R han Y A B C D E F G H S T U W Top Bigrams Frequency 0.00000200 004 0.015 0.0172 000 00012 0.011000110011400130 00 0.00 0.000000 0.010 2) Using this Playfair matrix: M F H I/J K U N 0 w P Q Y Z V L A R E D G S T B Encrypt this message: MUST SEE YOU OVER CADOGAN WEST COMING AT ONCE 1) Given the below ciphertext which has been encrypted using substitution cipher, answer the following questions UZQSOVUOHXMOPVGPOZPEVSGZWSZOPFPESXUDBMETSKAIZ VUEPHZHMDZSHZOWSFPAPPDTSVPQUZWYMXUZUHSX EPYEPOPDZSZUFPOMBZWPFUPZHMDJUDTMOHMQ a) Determine the frequency of repeating the following letters in the above ciphertext. P, Z, S, 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 zusz 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 014 12 0.12- 0.10- 0.091 0.00 0001 0.000 006- 004- 2040 0040 COR od 2.000.000 000- 0.024 0.000 0- 0.000 0.00 neon J K L M N O P Q R han Y A B C D E F G H S T U W Top Bigrams Frequency 0.00000200 004 0.015 0.0172 000 00012 0.011000110011400130 00 0.00 0.000000 0.010 2) Using this Playfair matrix: M F H I/J K U N 0 w P Q Y Z V L A R E D G S T B Encrypt this message: MUST SEE YOU OVER CADOGAN WEST COMING AT ONCE