Simple encryption algorithm

encrypt-example.js

class Security {
  static encrypt(text, password) {
    password = String(password);

    return String(text)
      .split('')
      .map((char, index) => String.fromCharCode(char.charCodeAt(0) + password.charCodeAt(index % password.length)))
      .join('');
  }

  static decrypt(text, password) {
    password = String(password);

    return String(text)
      .split('')
      .map((char, index) => String.fromCharCode(char.charCodeAt(0) - password.charCodeAt(index % password.length)))
      .join('');
  }
}

let
  text = 'Super Secret Text',
  password = 'Some Super-Password';

let
  encryptedText = Security.encrypt(text, password),
  decryptedText = Security.decrypt(encryptedText, password);

console.log(`Is : '${text}' === '${decryptedText}'`, decryptedText === text);
console.log(`Encrypted text: ${encryptedText}`);

/* Output:
 *
 * Is : 'Super Secret Text' === 'Super Secret Text' true
 * Encrypted text: ¦äÝʒsÈÕÈä…āÇØïã
 */