# Learn String Manipulation by Building a Cipher - Step 83

Hi! and thank you

Before the code pasted below i´ve tried this:
encryption = encrypt(text, custom_key)
decryption = decrypt(encryption, custom_key)
print("Encrypted text: "+ decryption)
print(decryption)

But even that the output looks right they are not the answer. ¿Any clue?

``````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: "+ decrypt(encryption,custom_key))

/* User Editable Region */

``````

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### Challenge Information:

Learn String Manipulation by Building a Cipher - Step 83

do not change the order of the lines, use the variable that contains that string already (hint: first line of the code)

1 Like

Hi ilenia
But if i don’t change the order the code it is not working, becouse i am calling a varible that has not been declared yet,

``````encryption = encrypt(text, custom_key)
print("Encrypted text: "+ decryption)
decryption = decrypt(encryption, custom_key)
print(decryption)
``````

If i use the first variable “encryption” the output it is not correct

``````encryption = encrypt(text, custom_key)
print("Encrypted text: "+ encryption)
decryption = decrypt(encryption, custom_key)
print(decryption)
``````

not that one, that’s not the first line of the code.

1 Like