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docs: improve sc docu

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Matthias Ringwald 2016-06-10 13:21:40 +02:00
parent 615df10cd8
commit ac85f41222
1 changed files with 2 additions and 3 deletions
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doc/manual/docs/protocols.md
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@ -767,14 +767,13 @@ To fix this, the Bluetooth Core V4.2 specification introduced the new
BTstack supports both pairing methods. To enable the more secure LE Secure Connections method,
*ENABLE_LE_SECURE_CONNECTIONS* needs to be defined in *btstack_config.h*.
LE Secure Connections are based on Elliptic Curve Diffie-Hellman (ECDH) keypairs.
LE Secure Connections are based on Elliptic Curve Diffie-Hellman (ECDH) algorithm for the key exchange.
On start, a new public/private key pair is generated. During pairing, the
Long Term Key (LTK) is generated based on the local keypair and the remote public key.
To facilitate the creation of such a keypairs and the calculation of the LTK,
the Bluetooth Core V4.2 specification introduced appropriate commands for the Bluetooth controller.
As an alternative for controller that don't provide these primitives, BTstack implements
the crytographic functions in software with the help of the Apache 2.0 Licensed [mbed TLS library](https://tls.mbed.org).
As an alternative for controllers that don't provide these primitives, BTstack provides the relevant crytographic functions in software via the Apache 2.0 licensed [mbed TLS library](https://tls.mbed.org).
There are two details to be aware about using LE Secure Connections: