If Sendoid is completely relying on RTMFP then the core security technology would have to be coming from Adobe. Check out Matthew Kaufmann's two year old talk on the subject: http://tv.adobe.com/watch/max-2008-develop/future-of-communi... Or Tom Krcha's blog which contains a number of Flash P2P entries: http://www.flashrealtime.com/ RTMFP is pretty fascinating technology that originates with a couple of very smart guys that Adobe brought on board (Matthew Kaufman and Michael Thornburgh). I'm curious if the Sendoid team has a non-Flash solution for 'restricted' devices.

If I understand RTFMP (what I know I got from reading Cumulus, an open source C++ implementation), the security side of this is not thrilling me:

* It's Diffie Hellman for key agreement, which is trivially MITM'd (odds are, you can even zero out the DH key and it won't notice).

* It uses AES in CBC mode with all-zeroes IV's (so it's less secure than CBC mode).

* It's using a 16 bit CRC for message integrity checks instead of a cryptographic MAC.

I say all this with the caveat that I could be misreading Cumulus or Cumulus could have it wrong, but if this is where RTMFP is today, then Sendoid is substantially less secure than an HTTPS file transfer site.

Thanks, and I'm hoping that part of flash works better than the video component on 64 bit linux.