Tell us what’s happening:
Describe your issue in detail here.
How is it that the expected output is the orignal text for the encryption print() statement?
if the original text is such that → text = ‘mrttaqrhknsw ih puggrur’, why do we also expect the encrypted output to be :
encryption = encrypt(text, custom_key)
print('Encrypted text: ’ + encryption)
Expected output :
Encrypted text: mrttaqrhknsw ih puggrur (which is wrong if we are encrypting )
Your code so far
text = 'mrttaqrhknsw ih puggrur'
custom_key = 'python'
def vigenere(message, key, direction=1):
key_index = 0
alphabet = 'abcdefghijklmnopqrstuvwxyz'
final_message = ''
for char in message.lower():
# Append any non-letter character to the message
if not char.isalpha():
final_message += char
else:
# Find the right key character to encode/decode
key_char = key[key_index % len(key)]
key_index += 1
# Define the offset and the encrypted/decrypted letter
offset = alphabet.index(key_char)
index = alphabet.find(char)
new_index = (index + offset*direction) % len(alphabet)
final_message += alphabet[new_index]
return final_message
def encrypt(message, key):
return vigenere(message, key)
def decrypt(message, key):
return vigenere(message, key, -1)
/* User Editable Region */
encryption = encrypt(text, custom_key)
print('Encrypted text: ' + encryption)
decryption = decrypt(encryption, custom_key)
print(decryption)
/* User Editable Region */
Your browser information:
User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36
Challenge Information:
Learn String Manipulation by Building a Cipher - Step 83