BLE - Numeric comparison

RE: BLE - Numeric comparison

Dmitry — Sun, 18 Jul 2021 19:38:36 GMT

Exactly.

RE: BLE - Numeric comparison

Roei — Sun, 18 Jul 2021 17:31:18 GMT

Thanks!

One more question - I assume the basic diffie-hellman (modulu functions) and elliptic curve diffie hellman work differently, but the idea of using public and private key and generating shared secret it the same, right?

RE: BLE - Numeric comparison

Dmitry — Sun, 18 Jul 2021 16:37:53 GMT

g2 uses both public keys and exchanged random numbers, not an ECDH secret:

RE: BLE - Numeric comparison

Roei — Sun, 18 Jul 2021 15:51:15 GMT

Ok,

So the random number is generated from diffie-hellman key?

RE: BLE - Numeric comparison

Dmitry — Sun, 18 Jul 2021 15:25:15 GMT

Hi,

function g2 includes both public keys. In case of MITM attack, one side will have PK(Alice)+PK(Eve), other side - PK(Eve)+PK(Bob), numbers will never match.