quencies of the English language Letter Frequency Letter Frequency А 0.0817 N 0.0675 0.0150 O 0.0751 0.0278 P 0.0193 0.0425 0.0010 0.1270 0.0599 ABUAH KUIHKLE с Н M 0.0223 0.0202 0.0609 0.0697 0.0015 0.0077 0.0403 0.0241 Q IRSEDDEXIN T U V W Y Z 0.0633 0.0906 0.0276 0.0098 0.0236 0.0015 0.0197 0.0007

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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The ciphertext below was encrypted using a substitution cipher. In your favorite language (in C++ or Python) crack encrypted text below using frequency analysis 

 

lrvmnir bpr sumvbwvr jx bpr lmiwv yjeryrkbi jx qmbm wi

bpr xjvni mkd ymibrut jx irhx wi bpr riirkvr jx

ymbinlmtmipw utn qmumbr dj w ipmhh but bj rhnvwdmbr bpr

yjeryrkbi jx bpr qmbm mvvjudwko bj yt wkbrusurbmbwjk

lmird jk xjubt trmui jx ibndt

 

wb wi kjb mk rmit bmiq bj rashmwk rmvp yjeryrkb mkd wbi

iwokwxwvmkvr mkd ijyr ynib urymwk nkrashmwkrd bj ower m

vjyshrbr rashmkmbwjk jkr cjnhd pmer bj lr fnmhwxwrd mkd

wkiswurd bj invp mk rabrkb bpmb pr vjnhd urmvp bpr ibmbr

jx rkhwopbrkrd ywkd vmsmlhr jx urvjokwgwko ijnkdhrii

ijnkd mkd ipmsrhrii ipmsr w dj kjb drry ytirhx bpr xwkmh

mnbpjuwbt lnb yt rasruwrkvr cwbp qmbm pmi hrxb kj djnlb

bpmb bpr xjhhjcwko wi bpr sujsru msshwvmbwjk mkd

wkbrusurbmbwjk w jxxru yt bprjuwri wk bpr pjsr bpmb bpr

riirkvr jx jqwkmcmk qmumbr cwhh urymwk wkbmvb

 

  1. Frequency analysis: write a program in C++ or python to compute the relative frequency of all letters A...Z in the ciphertext given above. 

    Table below
T
Table 1.1 Relative letter frequencies of the English language
Letter Frequency Letter Frequency
0.0817 N 0.0675
0.0150
O
0.0751
0.0278
0.0193
0.0425
0.0010
0.1270
0.0599
0.0223
0.0633
0.0202 T
0.0906
0.0609 U
0.0276
0.0697 V
0.0098
0.0015 W
0.0236
0.0077 X
0.0015
0.0403 Y
0.0197
0.0241
Z
0.0007
A
B
L
M
Transcribed Image Text:T Table 1.1 Relative letter frequencies of the English language Letter Frequency Letter Frequency 0.0817 N 0.0675 0.0150 O 0.0751 0.0278 0.0193 0.0425 0.0010 0.1270 0.0599 0.0223 0.0633 0.0202 T 0.0906 0.0609 U 0.0276 0.0697 V 0.0098 0.0015 W 0.0236 0.0077 X 0.0015 0.0403 Y 0.0197 0.0241 Z 0.0007 A B L M
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