I understand AES can do this. bkw
On Thu, 25 Dec 2003, Steve Underwood wrote: > Steven Critchfield wrote: > > >On Wed, 2003-12-24 at 19:11, Mahoney, Matt wrote: > > > > > >>Hi, > >> > >> > >>Does asterisk support any kind of voice encryption? > >> > >> > > > >Not right now. As I understand it, it is a problem with the fact that > >each packet would have to be able to be decrypted even if packets in the > >stream are lost. In the long run it is going to be a question of how > >secure do you need it to be. Afaik, the good encryption methods are > >stream based, and the loss of packets would kill the decryption. > > > >Add to that the problem of finding some encryption method that can deal > >with small packets without adding a lot of overhead. Each voice packet > >in IAX with GSM compression isn't very long. The voice data is only 33 > >bytes. > > > > > The need to tolerate packet losss means a continuous stream cypher can't > be used. That reduces the quality of the ciphering, but it can still be > pretty good. You know the packet sequence number (at least with RTP you > do), so some forms of sequentially changing encryption can still be > used. SRTP has been through the process of trying to deal with this in > the most effective manner, but doesn't seem to be widely used right now. > Free implementations exists - see srtp.sourceforge.net. I guess it > should be adaptable to IAX. > > Regards, > Steve > > > _______________________________________________ > Asterisk-Users mailing list > [EMAIL PROTECTED] > http://lists.digium.com/mailman/listinfo/asterisk-users > _______________________________________________ Asterisk-Users mailing list [EMAIL PROTECTED] http://lists.digium.com/mailman/listinfo/asterisk-users