Re: [Bluez-users] Key exchange before pairing

[Jordi Jaen Pallares <jordijp@gmail.com>]

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Hi Marcel,

first of all, thank you for your comments :-)

2005/6/30, Marcel Holtmann <marcel@holtmann.org>:
> 
> Hi Jordi,
> 
> > I´d like to generate the PIN based on the shared key derived from a
> > Diffie Hellman exchange between the bluetooth peers.
> 
> if you wanna use Diffie Hellman, for what reason do you want to use the 
> pairing and encryption of Bluetooth then.


I would like to use the pairing and encryption of bluetooth as usual, and 
use only the Diffie-Hellman exchange to generate a "stronger" PIN for the 
pairing. 

> Is it possible to trigger this exchange at pairing time using my own 
> > 'pin_helper' program ?
> 
> To exchange data you need a connection first. This means you can only do
> this in security mode 1 and 2. The PIN helper can't be used for any of
> these task except entering a PIN.


But then, is there any other way for the peers to exchange previous 
communication attributes than using the SDP protocol ?

Is it possible to exchange information by previously registering a new 
service (with a fixed PSM) and then negociate the parameters directly using 
L2CAP sockets ?

Regards,

Jordi


Regards
> 
> Marcel
> 
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