Lab: Caesar Cipher implementation with Python letters='ABCDEFGHIGKLMNOPQRSTUVWXYZ KEY=3 def caesar_encrypt(plain_text): cipher_text=" plain_text= plain_text.upper() for I in plain text: index= letters.find(1) index = (index + KEY) % len(letters) cipher_text= cipher_text + letters[index] return cipher_text def caesar decrypt(cipher_text): plain_text=" for I in cipher_text: index= letters.find(1) index= (index - KEY) % len(letters) plain_text= plain_text + letters[index] return plain_text if name =='__main__': message = 'Welcome to my Cryptography class' encrypted_message = caesar_encrypt(message) print(encrypted_message) print(caesar_decrypt(encrypted_message)) In the previous page, we define letters as 'ABCDEFGHIGKLMNOPQRSTUVWXYZ to obtain the index of a character in encryption and decryption. The characters in the plain text and the cipher text have to be from 'ABCDEFGHIGKLMNOPQRSTUVWXYZ". In this lab, try to modify the code in the previous page to allow your python code to handle any characters in in the plain text and the cipher text Hint: use ASCII index(value) to represent a character. The python method which returns the ACSII index is ord().

Lab: Caesar Cipher implementation with Python letters='ABCDEFGHIGKLMNOPQRSTUVWXYZ KEY=3 def caesar_encrypt(plain_text): cipher_text=" plain_text= plain_text.upper() for I in plain text: index= letters.find(1) index = (index + KEY) % len(letters) cipher_text= cipher_text + letters[index] return cipher_text def caesar decrypt(cipher_text): plain_text=" for I in cipher_text: index= letters.find(1) index= (index - KEY) % len(letters) plain_text= plain_text + letters[index] return plain_text if name =='main': message = 'Welcome to my Cryptography class' encrypted_message = caesar_encrypt(message) print(encrypted_message) print(caesar_decrypt(encrypted_message)) In the previous page, we define letters as 'ABCDEFGHIGKLMNOPQRSTUVWXYZ to obtain the index of a character in encryption and decryption. The characters in the plain text and the cipher text have to be from 'ABCDEFGHIGKLMNOPQRSTUVWXYZ". In this lab, try to modify the code in the previous page to allow your python code to handle any characters in in the plain text and the cipher text Hint: use ASCII index(value) to represent a character. The python method which returns the ACSII index is ord().

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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Lab: Caesar Cipher implementation with Python
letters='ABCDEFGHIGKLMNOPQRSTUVWXYZ"
KEY=3
def caesar_encrypt(plain_text):
plain_text=plain_text.upper()
for I in plain_text:
index = letters.find(1)
index= (index + KEY) % len(letters)
cipher_text cipher_text + letters[index]
return cipher_text
cipher_text="
def caesar_decrypt(cipher_text):
plain_text = "
for I in cipher_text:
index = letters.find(1)
index= (index - KEY) % len(letters)
plain_text=plain_text + letters[index]
return plain_text
if name == '_____main__':
message = 'Welcome to my Cryptography class'
encrypted_message = caesar_encrypt(message)
print(encrypted_message)
print(caesar_decrypt(encrypted_message))
In the previous page, we define letters as
'ABCDEFGHIGKLMNOPQRSTUVWXYZ' to obtain the index of a
character in encryption and decryption. The characters in the plain text
and the cipher text have to be from
ABCDEFGHIGKLMNOPQRSTUVWXYZ'.
In this lab, try to modify the code in the previous page to allow your
python code to handle any characters in in the plain text and the cipher
text
Hint: use ASCII index(value) to represent a character. The python
method which returns the ACSII index is ord().

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