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substitution cipher

Disgusted Duck answered on June 26, 2022 Popularity 10/10 Helpfulness 1/10

answer substitution cipher

substitution cipher

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# Python program to demonstrate
# Substitution Cipher
 
 
import string
 
 
# A list containing all characters
all_letters= string.ascii_letters
  
     
"""
create a dictionary to store the substitution
for the given alphabet in the plain text
based on the key
"""
  
     
dict1 = {}
key = 4
  
for i in range(len(all_letters)):
    dict1[all_letters[i]] = all_letters[(i+key)%len(all_letters)]
  
  
plain_txt= "I am studying Data Encryption"
cipher_txt=[]
  
# loop to generate ciphertext
  
for char in plain_txt:
    if char in all_letters:
        temp = dict1[char]
        cipher_txt.append(temp)
    else:
        temp =char
        cipher_txt.append(temp)
         
cipher_txt= "".join(cipher_txt)
print("Cipher Text is: ",cipher_txt)
  
     
"""
create a dictionary to store the substitution
for the given alphabet in the cipher
text based on the key
"""
  
     
dict2 = {}    
for i in range(len(all_letters)):
    dict2[all_letters[i]] = all_letters[(i-key)%(len(all_letters))]
      
# loop to recover plain text
decrypt_txt = []
 
for char in cipher_txt:
    if char in all_letters:
        temp = dict2[char]
        decrypt_txt.append(temp)
    else:
        temp = char
        decrypt_txt.append(temp)
         
decrypt_txt = "".join(decrypt_txt)
print("Recovered plain text :", decrypt_txt)

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Source: www.geeksforgeeks.org

Tags: substitution whatever

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Contributed on Jun 26 2022

Disgusted Duck

0 Answers Avg Quality 2/10

substitution cipher

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