Subject: Re: [Iotops] OPC UA FLC and TLS

From: Christer Holmberg <[email-masked]>
Date: Tue, 3 Aug 2021 20:02:00 +0000

Hi,

>>> When I watched the YouTube video from them iotops session someone claimed
>>> that OPC UA FLC “re-invented” TLS. What was meant by that?
>>>
>> That was my mistake.  Other organizations (not OPC UA) have reinvented TLS,
>> but OPC UA is just out of date, so far as I can tell.[1]
>
> My understanding is that OPC UA has a legacy DCOM based system that uses RSA signature for authentication, but is not related to TLS/SSL/etc.
> But that they use TLS and DTLS (1.3 even) in the latest specifications.

The original OPC protocol, referred to as "classic OPC", is based on DCOM. OPC UA is not bound to some specific OS/platform/technology, and you can use other algorithms than RSA. 

Regards,

Christer