Beware. This is not a new idea. Patents?.... ;)
Btw. i would suggest bashing the phones together. (like a wood block
instrument)
This will produce uinique paterns which do not depend very much on the
resolution of the accelerometers and could easyly picket up by a legacy
microphone of any hone without accelerometer.
Just my 2 Eurocent ;)
PS: Great idea indeed. We need this...
PS: I know Eve could hear the sounds of the phone bashing together and
play a replay attack. But come on, it is Bluetooth.
The only reason Bluetooth is not considered insecure is frequency
hopping. The crypro layer is lame.
Heikki Sørum wrote:
When were talking about different ways to use accelerometers..
Bob meet's Alice and they both want each others contact
information. First Bob and Alice shake their phones in an predetermined
password pattern to unlock the
bluetooth/zigbe/(whatever-short-range-radio).
Then they both shake their phones in rythm to an short tune
playing on Alice's phone. The phones then pair with the
other phone, exchange simple authkeys and Vcards.
Now Bob and Alice has authenticated each others phones and they got
each others phone number. Lucky Bob and Alice!
On an more serious note, Two such paired bluetooth devices could also
exchange an RSA/DSA encryption key to ensure private
SMS/MMS/conversations.
Heikki Soerum.
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