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Caeser_cipher.py
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Caeser_cipher.py
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upper_alpha = ['A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L',
'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z']
lower_alpha = ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o',
'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y','z']
numbers = ['0', '1', '2', '3', '4', '5', '6', '7', '8', '9']
def encrypt(word):
shift =int(input("Enter shift number : "))
encrypt = []
for i in word:
if(i.isupper() == True):
index = upper_alpha.index(i)
index += shift
if(index > 25):
index -= round((index//26) * 26)
encrypt.append(upper_alpha[index])
elif (i == " "):
encrypt.append(i)
else:
index = lower_alpha.index(i)
index += shift
if (index > 25):
index -= round((index//26) * 26)
encrypt.append(lower_alpha[index])
joinword = "".join(encrypt)
return joinword
def decrypt(word):
shift = int(input("Enter shift number : "))
decrypt = []
for i in word:
if (i.isupper() == True):
index = upper_alpha.index(i)
index -= (shift)
if (index < 0):
index -= round((index//26) * 26)
decrypt.append(upper_alpha[index])
elif(i == " "):
decrypt.append(i)
else:
index = lower_alpha.index(i)
index -= shift
if (index < 0):
index -= round((index//26) * 26)
decrypt.append(lower_alpha[index])
joinword = "".join(decrypt)
return joinword
word = input("Enter the word: ")
print("*** \t 1 : Encrypt Word \t *** \n*** \t 2 : Decrypt Word \t *** ")
choice = int(input("Enter Choice : "))
if(choice == 1):
print (f"Your Encrypted Message is ; {encrypt(word)}")
elif(choice == 2):
print(f"Your Decrypted Message is ; {decrypt(word)}")
else:
print("Enter valid choice.")