Blackberry PlayBook Tablet Aperçu technique de la sécurité - Page 14

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Blackberry PlayBook Tablet Aperçu technique de la sécurité
Security Technical Overview
uses a unique, random, ephemeral key pair to create the new BlackBerry Bridge pairing key. The tablet discards
the ephemeral key pair after generating the BlackBerry Bridge pairing key. Even if the ephemeral private keys from
a specific protocol run of the ECDH algorithm are compromised, the BlackBerry Bridge pairing keys from other
runs of the same protocol remain uncompromised.

Process flow: Generating a BlackBerry Bridge pairing key

1.
The BlackBerry smartphone sends an initial echo of the value 0xC1F34151520CC9C2 to the BlackBerry PlayBook
tablet to confirm that a Bluetooth connection to the tablet exists and to verify that both the smartphone and
tablet understand the protocol.
2.
The tablet receives the initial echo and replies with an echo transmission of the same value.
3.
The smartphone receives the echo and uses the algorithm that the initial key establishment protocol negotiated
to send the selected algorithms, the selected elliptic curve, and a seed to the tablet.
4.
The tablet performs the following calculation to select a short-term key (Y):
•
Selects random y, 1 < y < r – 1
•
Calculates Y = yP, where P is a fixed point on the selected elliptic curve that generates a subgroup of prime
order
5.
The tablet sends Y to the smartphone.
6.
The smartphone performs the following calculation to select a short-term key (X):
•
Selects random x, 1 < x < r – 1
•
Calculates X = xP
•
Calculates the BlackBerry Bridge pairing key (CK) using the following information:
Parameter
K
H1
H2
H
CK
7.
The smartphone sends X to the tablet.
8.
The tablet calculates the BlackBerry Bridge pairing key (CK) using the following information:
Parameter
K
H1
H2
H
CK
The smartphone and tablet share a BlackBerry Bridge pairing key.
12
Generating a BlackBerry Bridge pairing key during the BlackBerry Bridge pairing process
Value
xY = xyP
SHA-512 (sent data packets)
SHA-512 (received data packets)
H1 + H2
SHA-256 ( MK || H || MK || K )
Value
yX = yxP
SHA-512 (sent data packets)
SHA-512 (received data packets)
H1 + H2
SHA-256( MK || H || MK || K )