security - Securing RTP packets without encrypting each packets -


in voip, understand encrypting sip transmission hide information codec used. way encrypting rtp payload, transmitting srtp/zrtp in network. encrypting each packet take quiet lot of processing in both end. have seen few materials scrambling rtp (header or payload - no idea). can please suggest me if there other ways can use securing rtp, in case if eavesdropped, attacker nothing.

i believe of concerns addressed in following ietf spec - https://tools.ietf.org/html/rfc7201 - options securing rtp sessions

but imo, there cost of security w.r.t processing , thats given enhanced layer of protection. haven't come across other fancier ways other encoding , decoding custom codec can build signal processing proprietary application. in case, limits interoperability of application still keeps open brute force hacking if possible.


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