Question
The ciphertext below with 200 characters is the output of a simple substitution cipher (spaces and punctuation have been removed) of some English language text.
The ciphertext below with 200 characters is the output of a simple substitution cipher (spaces and punctuation have been removed) of some English language text.
PXZFYAXZVVZBYQRMHBSLWTLHTOYTUHXHAHPSLYGSAWTHAASAWT
RXWAFZPXHMALZPAYTJLYTAPZFYTSDYUPSMHZWTPFHTPWTPXHDY
FWVQIWPUXHTYTJVYPHMYJJHJLWVVAPZXWAMYTRHZDLMZJSUPAG
QPXHPWFHZDXWAJHYPXXHBYAZTHZDPXHMWUXHAPFHTWTGMWPYWT
The frequency counts for these ciphertext characters are given in the Table below, and the bigram PX occurs six times trigram PXH occurs three times.
A B C D E F G H I J K L M
16 3 0 5 0 7 3 22 1 7 0 7 8
N O P Q R S T U V W X Y Z
0 1 19 3 3 7 18 5 6 16 14 16 13
Use frequency analysis and other characteristics of the English language to find the corresponding plaintext (adding spaces and punctuation). It is known that
(i) Z is the ciphertext character for o,
(ii) T is the ciphertext character for n and
(iii) the words ointment, death and britain occur in the plaintext.
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