docs: function encrypt(message) {
    if (this.secure && this.cipher && this.secret) {
      if (this.secret === 'secret') {
        console.warn('PLEASE change default secret password!');
      }
      debug('%s encrypt message with %s', this.name, this.cipher);
      var cipher = crypto.createCipher(this.cipher, this.secret);
      return Buffer.concat([cipher.update(message), cipher.final()]);
    }
    return message;
  }