Configure OBS Studio for Secure Stream Transmission

To prevent unauthorized users from intercepting your stream key and hijacking your broadcast, you must encrypt the data sent from OBS Studio to your streaming platform. This article explains how to configure OBS Studio to transmit your stream key and password securely over the network using encrypted protocols like RTMPS and SRT.

Step 1: Use RTMPS Instead of RTMP

Standard RTMP (Real-Time Messaging Protocol) transmits your stream key in plain text, making it vulnerable to packet sniffing on public or compromised networks. RTMPS (RTMP over TLS/SSL) encrypts this connection.

  1. Open OBS Studio and go to Settings > Stream.
  2. Under Service, select your streaming platform (e.g., YouTube, Facebook Live). Major platforms default to RTMPS automatically when using their built-in connectors.
  3. If you are using a custom streaming server, change the Service dropdown to Custom….
  4. In the Server field, ensure the URL begins with rtmps:// instead of rtmp://. This forces OBS to establish a secure, encrypted handshake on port 443.
  5. Paste your stream key into the Stream Key field and click Apply.

Step 2: Configure SRT with AES Encryption

Secure Reliable Transport (SRT) is a modern streaming protocol that supports high-security AES encryption. If your ingest server supports SRT, you can configure OBS to encrypt the stream at the protocol level.

  1. In OBS Studio, go to Settings > Stream.
  2. Set the Service dropdown to Custom….
  3. In the Server field, enter your SRT destination URL using the following format to enable encryption: srt://example.com:port?mode=caller&passphrase=YOUR_SECRET_PASSPHRASE&pbkeylen=32
    • Replace example.com:port with your destination address and port.
    • Replace YOUR_SECRET_PASSPHRASE with a strong password (minimum 10 characters).
    • The pbkeylen=32 parameter specifies AES-256 encryption (use 16 for AES-128 or 24 for AES-192).
  4. Leave the Stream Key field blank, as the security is handled by the passphrase in the URL. Click Apply.

Step 3: Enable Secure RTMP Authentication

If you are streaming to a private server that requires a username and password but does not support RTMPS, you can still encrypt the login credentials using built-in OBS authentication.

  1. Go to Settings > Stream and select Custom….
  2. Enter your server URL and Stream Key.
  3. Check the box for Use authentication.
  4. Enter the Username and Password provided by your streaming host.
  5. Note that while this secures your login credentials during the handshake, it does not encrypt the video data itself. For full security, always pair this with an rtmps:// server URL.