July 2016
Intermediate to advanced
300 pages
6h 49m
English
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Encrypting (S)RTP via SDES (key exchange in SDP)
SRTP in its oldest, simplest and most deployed implementation encrypts the (UDP) audio stream using a key that was exchanged via SIP(S), in the SDP body of the SIP packet.
This method, called SDES (SDP Security Descriptions), can be considered secure under two conditions:
- Encrypted SIPS (for example, TLS) was used for exchanging keys in signaling
- All the SIP(S) proxies between caller and callee are trusted
Because SIP(S) packets must be interpreted by proxies, the organizations that own or manage each single proxy between caller and callee know the key and can decrypt the audio. Also, someone can succeed in inserting him or herself into the proxy chain, and acting as a man-in-the-middle (mitm), pretending ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.