Am Fr  16. Mai 2008 schrieb Al Johnson:

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> On Friday 16 May 2008, ramsesoriginal wrote:

> > I was just wondering: we have seen the problems of encryptingcalls.

> > But what about decrypting them? Let*s say someone hasa method to call

> > you with some sort of encryption.. would it be possible to write a

> > decryption for it? Maybe public key?

>

> Depends what sort of calls you mean. If it's GSM voice calls then the same

> problems apply as already discussed. If you're talking about a data link

> encrypted end to end and passing voice data then it's possible, probably

> using established standards. You could make an OpenVPN or IPsec tunnel end

to

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> end, then use SIP, h323 or IAX2 over it. You could use one of the secured

> versions of SIP directly, at least one of which uses public keys, but none

of

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> them are universally accepted. 

What about ZRTP? (Zimmerman, PGP inventor). Have a look at twinkle.com! Via

GSM you can setup not only voice calls, but also fax and *DATA* calls with up

to 14400bps. Tunneling SIP and low bandwidth RTP/ZRTP through this link

should be feasible with low effort
/j

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> You could even roll your own protocol using

> TLS or something.

>

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