Cipher Solutions

Superior Vigenère

Welcome to Cipher Solutions' most elite encryption service: Superior Vigenère! This is where the pros come to play.

• Get your hands on the most exclusive encryption keys in the business
• Consult with our team of expert cryptographers (we'll pretend to listen)
• Don't get caught in a bind? Get a free decryption guarantee!

// Vigenère cipher implementation in JavaScript

function vigenere_cipher(text, key) {
  let alphabet = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ';
  let cipher_text = '';
  let key_index = 0;

  for (let char of text) {
    if (alphabet.includes(char.toUpperCase())) {
      let char_index = alphabet.indexOf(char.toUpperCase()) + 1;
      let key_char = key[key_index % key.length];
      let key_index = (key_index + 1) % key.length;
      let encrypted_char = alphabet[(char_index + char.charCodeAt(0)) % alphabet.length];
      cipher_text += encrypted_char;
    } else {
      cipher_text += char;
    }
  }

  return cipher_text;
}

// Example usage:
let text = 'Hello, World!';
let key = 'secret_key';
let encrypted_text = vigenere_cipher(text, key);
console.log(encrypted_text);