_encrypt

# File activesupport/lib/active_support/message_encryptor.rb, line 69
    def _encrypt(value)
      cipher = new_cipher
      cipher.encrypt
      cipher.key = @secret

      # Rely on OpenSSL for the initialization vector
      iv = cipher.random_iv

      encrypted_data = cipher.update(@serializer.dump(value))
      encrypted_data << cipher.final

      "#{::Base64.strict_encode64 encrypted_data}--#{::Base64.strict_encode64 iv}"
    end