Transmission Grade Live Audio over IP Networks and the Internet...

AES Encryption of your audio... for a radio programme? REALLY?

12 March, 2014 | Broadcast Audio over IP

undefinedAudioTX STL-IP Plus, STL-IP-8, STL-IP-16 and the STL-IP Connect software all allow you to encrypt your audio using probably one of the most secure encryption methods available today.  At first glance, it might seem an odd 'feature' to include... so let's explain!

Broadcasters by their very raison d'être actually do publish their content and programmes... and generally in the most public way possible. So, assuming you have no reason for security or privacy, why would encrypting your audio be useful? Because it guarantees the source of your audio - i.e. you are actually broadcasting what you intend.

The audio encryption offered by AudioTX STL-IP products encrypts every second of your audio and guarantees that only devices sharing the correct key can connect and decode the audio for you.  Nobody else can listen in.  Once enabled, nobody else can connect to your units to receive or send audio.

As an example, let's say you plan to syndicate your programming and deliver it over the Internet to 4 different radio stations. Each of these has an STL-IP Plus unit and you also use one to send your audio. Defining your own encryption keys using a passphrase would ensure that only audio being sent by you will actually be output by the receiving STL-IP Plus units.
In short, the radio stations receiving your programming know that it actually did come from you!

Perhaps you intend to use the Intenet for your STL (Studio to Transmitter Link)... perhaps enjoying the amazing reliability offered by SureFlow/5.  Again, using our encryption means that only an STL-IP Plus unit at the studio that has been programmed with your encryption passphrase or key will be able to successfully send audio to the unit at your transmitter site.

Here's another one... maybe you're doing an outside/remote broadcast or you have multiple news reporters in the field during a fast breaking news story -  that you may have to put to air at very short notice -  perhaps even opening that fader immediately as they connect.  If they are using STL-IP Connect or STL-IP Plus units, again you can set an encryption key so you know it's one of your own people connected to you at the studio without even hearing their voice.

To be clear, this isn't just a 'password'... instead every tiny bit of the live audio being delivered during every second of the connection is encrypted using one of the strongest encryption algorithms available today. undefined


Of course there are some scenarios where you do need your audio to be verifiably private. For example, content distribution agreements may mean that you are only able to distribute your audio to certain locations, countries or markets. And, contractually, you may need to be able to prove that you have taken reasonable care to comply with these requirements. Our encryption options allow you to do this and guarantee that only those with whom you share your encryption keys or passphrases can receive your audio.

Of course STL-IP products are also used in many applications outside the broadcast radio, TV and media industries -  and here there's a near-endless list of scenarios and reasons why customers do require absolute security and the reassurance that their audio is sent and received securely and can be kept completely private.

A few words about AES -  the encryption itself.  The Advanced Encryption Standard (AES) is a specification for the encryption of electronic data established by the U.S. National Institute of Standards and Technology (NIST) in 2001 but was actually developed by two Belgian cryptographers.  It's a government approved encryption algorithm in most countries worldwide and is generally accepted to be secure enough even for the most 'secret' of information or data being held or exchanged electronically.  This includes information described as 'classified' and even 'top secret'.  Wow.  Put simply it's far more secure than you'd ever need or expect it to be based even on possible attacks by today's fastest and biggest computers.  We use the full 256 bit AES keys which are the biggest available (larger is better).  Here's some more information for the technically minded:

You can make up and enter your desired key directly... but much nicer and easier is to use a passphrase -  which may include letters, numbers, symbols, punctuation, spaces etc and which is then hashed (translated) into a key for you.

Our AES encryption uses full 256bit keys and is available on STL-IP Plus as standard. See



comments powered by Disqus
STL-IP main website     Blog Home


Will THE REAL STL-IP please stand up