Private telephone conversations: Dynamic encryption keeps secrets

http://www.sciencedaily.com/releases/2014/10/141007092106.htm

 

Unless I'm missing something, this just uses session keys for backward/forward secrecy. No?

 

I don't know if only key changes every time or anything else also:

 

Right, it's not specified. But I didn't dig for specifics.

One concern is that custom schemes aren't considered secure. But this may just be an implementation tweak, and so OK.