Cipher Generator

A simple encryption and decryption tool that supports Vigenère and Caesar ciphers. Works with all printable ASCII characters (codes 32–126).

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Features

• Encrypt or decrypt text:
  • Vigenère Cipher: Key-based encryption using a string.
  • Caesar Cipher: Shift-based encryption using an integer.
• Interactive menu-driven interface.
• Input validation for plaintext, ciphertext, and keys.

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Example Usage

Encrypt with Vigenère Cipher:

./cipher.py encrypt v "Hello World" "Hello World"

Will output:

Encrypted message:
1kyy @O &yi

Encrypt with Caesar Cipher:

./cipher.py encrypt c "Hello World" 3

Will output:

Encrypted message:
Khoor#Zruog

Decrypt with Vigenère Cipher:

./cipher.py decrypt v "1kyy @O &yi" "Hello World"

Will output:

Decrypted message:
Hello World

Decrypt with Caesar Cipher:

./cipher.py decrypt c "Khoor#Zruog" 3

Will output:

Decrypted message:
Hello World