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Please visit htt ps://en.wikipedia.org/wiki/Caesar cipher. You will be writing code that encrpyts and decrypts using this method. Specifically, you'll be writing functions: E„(x) (x+ n) mod 27 D„(1) (1 – n) mod 27 On the Wiki page, the modulus (%) is 26, but we're using 27-why? We are adding an extra symbol { for space. Please visit https://en.wikipedia.org/wiki/ASCII If you look at the printable ASCII characters, you'll notice that { (hex value 7A) follows z. Thus we can easily extend our cypher to include this symbol for space. Let's see how. 1 sentence "4his is a secret message about the class" 2 sentence.replace (" ", "(") sentence 3 print (sentence) 4 es - for i in sentence: es - encrypt(i, 5) 7 print (es) 6 8 9 ds - 10 for i in es : ds - decrypt (i, 5) 11 12 13 o_sentence - ds. replace ("(", " ") 14 print (o sentence) has output 1 this {is {a{seeret {message{about {the {class 2 ymnxenxefexjhwjycrjxxfljefgtzycy mjchqfxx 3 this is a seeret message about the class In this cypher we are shifting by five. Look at the first letter t. Here is the shift in Python: 1 >>> ord ('L') 2 116 3 >>> chr (ord ('t') + 5) 4 'y' 5 > chr (ord ('h') + 5) 6 m' Line one is our original sentence with { replacing space. Line two is the encrypted sentence. Line 3 the decrypted sentence. The shift is five, so we replace t' with 'y' and 'h' with 'm'. What

Please visit htt ps://en.wikipedia.org/wiki/Caesar cipher. You will be writing code that encrpyts and decrypts using this method. Specifically, you'll be writing functions: E„(x) (x+ n) mod 27 D„(1) (1 – n) mod 27 On the Wiki page, the modulus (%) is 26, but we're using 27-why? We are adding an extra symbol { for space. Please visit https://en.wikipedia.org/wiki/ASCII If you look at the printable ASCII characters, you'll notice that { (hex value 7A) follows z. Thus we can easily extend our cypher to include this symbol for space. Let's see how. 1 sentence "4his is a secret message about the class" 2 sentence.replace (" ", "(") sentence 3 print (sentence) 4 es - for i in sentence: es - encrypt(i, 5) 7 print (es) 6 8 9 ds - 10 for i in es : ds - decrypt (i, 5) 11 12 13 o_sentence - ds. replace ("(", " ") 14 print (o sentence) has output 1 this {is {a{seeret {message{about {the {class 2 ymnxenxefexjhwjycrjxxfljefgtzycy mjchqfxx 3 this is a seeret message about the class In this cypher we are shifting by five. Look at the first letter t. Here is the shift in Python: 1 >>> ord ('L') 2 116 3 >>> chr (ord ('t') + 5) 4 'y' 5 > chr (ord ('h') + 5) 6 m' Line one is our original sentence with { replacing space. Line two is the encrypted sentence. Line 3 the decrypted sentence. The shift is five, so we replace t' with 'y' and 'h' with 'm'. What

Database System Concepts
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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Please visit https://en.wikipedia.org/wiki/Caesar_cipher. You will be writing code that encrpyts and decrypts using this method. Specifically, you'll be writing functions: E,(1) (z+ n) mod 27 D„(1) (1- n) mod 27 On the Wiki page, the modulus (%) is 26, but we're using 27-why? We are adding an extra symbol { for space. Please visit https://en.wikipedia.org/wiki/ASCII. If you look at the printable ASCII characters, you'll notice that { (hex value 7A) follows z. Thus we can easily extend our cypher to include this symbol for space. Let's see how. 1 sentence "this is a secret message about the class" sentence sentence. replace (" ", "{") 3 print (_sentence) 4 es - 5 for i in sentence: es - encrypt (i, 5) 7 print (es) 6 8. 9 ds - 10 for i in es : 11 ds - decrypt(i, 5) 12 13 O_sentence ds. replace ("{", " ") 14 print (o_sentence) has output 1 this {is{a{secret{message{about {the{class 2 ymnxenxefexjhwjyerjxxfljefgtzyeymjchqfxx this is a secret message about the class In this cypher we are shifting by five. Look at the first letter t. Here is the shift in Python: >>> ord ('L') 2 116 3 >>> chr (ord ('t') + 5) 4 'y' 5 >> chr (ord ('h') + 5) 6. 'm' Line one is our original sentence with { replacing space. Line two is the encrypted sentence. Line 3 the decrypted sentence. The shift is five, so we replace t with 'y' and 'h' with 'm'. What 2.
Transcribed Image Text:Please visit https://en.wikipedia.org/wiki/Caesar_cipher. You will be writing code that encrpyts and decrypts using this method. Specifically, you'll be writing functions: E,(1) (z+ n) mod 27 D„(1) (1- n) mod 27 On the Wiki page, the modulus (%) is 26, but we're using 27-why? We are adding an extra symbol { for space. Please visit https://en.wikipedia.org/wiki/ASCII. If you look at the printable ASCII characters, you'll notice that { (hex value 7A) follows z. Thus we can easily extend our cypher to include this symbol for space. Let's see how. 1 sentence "this is a secret message about the class" sentence sentence. replace (" ", "{") 3 print (_sentence) 4 es - 5 for i in sentence: es - encrypt (i, 5) 7 print (es) 6 8. 9 ds - 10 for i in es : 11 ds - decrypt(i, 5) 12 13 O_sentence ds. replace ("{", " ") 14 print (o_sentence) has output 1 this {is{a{secret{message{about {the{class 2 ymnxenxefexjhwjyerjxxfljefgtzyeymjchqfxx this is a secret message about the class In this cypher we are shifting by five. Look at the first letter t. Here is the shift in Python: >>> ord ('L') 2 116 3 >>> chr (ord ('t') + 5) 4 'y' 5 >> chr (ord ('h') + 5) 6. 'm' Line one is our original sentence with { replacing space. Line two is the encrypted sentence. Line 3 the decrypted sentence. The shift is five, so we replace t with 'y' and 'h' with 'm'. What 2.
about { ? It starts at the beginning at 'a' and returns 'e' which is five spaces. You are free to use chr and ord in Python or you can make a dictionary. You have complete control on how this is implemented. What the arguments to encrypt and decrypt? E,(1) and D,(x) take two parameters each. The letter and the amount of shift. Observe we retain the shift for all calls to both encrypt and decrypt. Writing encrypt and decrypt might be easier if you use a dictionary-but that's entirely up to you. Deliverables Problem 4 • Complete encrypt and decrypt. We use { to encode space • You can use replace() • a dictionary will likely make the functions more easily implemented • Provide docstrings for the functions
Transcribed Image Text:about { ? It starts at the beginning at 'a' and returns 'e' which is five spaces. You are free to use chr and ord in Python or you can make a dictionary. You have complete control on how this is implemented. What the arguments to encrypt and decrypt? E,(1) and D,(x) take two parameters each. The letter and the amount of shift. Observe we retain the shift for all calls to both encrypt and decrypt. Writing encrypt and decrypt might be easier if you use a dictionary-but that's entirely up to you. Deliverables Problem 4 • Complete encrypt and decrypt. We use { to encode space • You can use replace() • a dictionary will likely make the functions more easily implemented • Provide docstrings for the functions
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