Challenge: Implementing Caesar Cipher
Taak
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Now, we will implement a simple function that provides data encryption using Caesar cipher.
Your task is to:
- Check if the character is alphabetic inside the
forloop of thecaesar_cipher()function. Use the.isalpha()method to do it. - Set the value of the
keyvariable equal to3. - Call the
caesar_cipher()and specify the required arguments (plaintextandkey).
Note
To provide decryption, we can use the same function but with other arguments:
caesar_cipher(encrypted_text, neg_key)whereneg_key=- key.
Oplossing
def caesar_cipher(text, key):
result = ""
# Loop through each character in the input text
for char in text:
if char.isalpha(): # Check if the character is alphabetic
start = ord('A') if char.isupper() else ord('a') # Set the starting point based on uppercase or lowercase
result += chr((ord(char) - start + key) % 26 + start) # Apply the Caesar cipher formula
else:
result += char # Non-alphabetic characters remain unchanged
return result
# Example Usage:
plaintext = "1WORLD2" # Change the word for encryption
key = 3
encrypted_text = caesar_cipher(plaintext, key)
# Print the results
print(f"Plaintext: {plaintext}")
print(f"Key: {key}")
print(f"Encrypted Text: {encrypted_text}")
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Sectie 3. Hoofdstuk 3
def caesar_cipher(text, key):
result = ""
# Loop through each character in the input text
for char in text:
if char.___(): # Check if the character is alphabetic
start = ord('A') if char.isupper() else ord('a') # Set the starting point based on uppercase or lowercase
result += chr((ord(char) - start + key) % 26 + start) # Apply the Caesar cipher formula
else:
result += char # Non-alphabetic characters remain unchanged
return result
# Example Usage:
plaintext = "1WORLD2" # Change the word for encryption
key = ___
encrypted_text = caesar_cipher(___, ___)
# Print the results
print(f"Plaintext: {plaintext}")
print(f"Key: {key}")
print(f"Encrypted Text: {encrypted_text}")
