@@ -140,7 +140,7 @@ BTP uses three cryptographic primitives:
### 2.1 Key Derivation Function
BTP uses a **key derivation function** to derive encryption and authentication keys from the shared secret S. Forward secrecy relies on a one-way nature of the key derivation function.
BTP uses a **key derivation function** to derive encryption and authentication keys from the shared secret S. Forward secrecy relies on the one-way nature of the key derivation function.
The key derivation function is based on PRF(k, m):
