Re: [rtcweb] SRTP not mandatory-to-use

[Bernard Aboba <[e-mail]>]

Markus Isomaki said: 

> Looking at the specs of any recent smartphones with Wi-Fi and/or 3G connectivity, even the low-end ones seem to have at least 600 MHz ARM. Anything that I could imagine running WebRTC, in terms of real products, will have an even faster CPU. 

[BA] I agree that computational load is a non-issue.  I've deployed very inexpensive devices (e.g. ATAs costing less than $100) that support SRTP (albeit only with simple keying mechanisms like SDES).   

In practice, it's not SRTP computational load, but interop particularly in keying mechanisms where the issue is.  I've had to advise customers to turn SRTP off on devices that claim to support it, due to interop issues (e.g. SDES).  

There is some support out there for ZRTP, but few DTLS/SRTP implementations.