curriculum/challenges/english/blocks/learn-string-manipulation-by-building-a-cipher/65552b14e803731fe3c1e4ca.md
Next, modify your encryption and decryption variables by calling encrypt and decrypt, respectively, in place of vigenere.
Your encryption variable should have the value of encrypt(text, custom_key).
({ test: () => assert.match(code, /^encryption\s*=\s*encrypt\s*\(\s*text\s*,\s*custom_key\s*\)/m) })
Your decryption variable should have the value of decrypt(encryption, custom_key).
({ test: () => assert.match(code, /^decryption\s*=\s*decrypt\s*\(\s*encryption\s*,\s*custom_key\s*\)/m) })
text = 'Hello Zaira!'
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
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def encrypt(message, key):
return vigenere(message, key)
def decrypt(message, key):
return vigenere(message, key, -1)
encryption = vigenere(text, custom_key)
print(encryption)
decryption = vigenere(encryption, custom_key, -1)
print(decryption)
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