Nowadays many embedded applications need to be secure and demand low power operations. The power consumption of designs varies with the implementation choices made by designers. Speed increasing is a key parameters for today’s processor but usually this means more power consumption. A trade-off between these 2 parameters must be found. This work involves the development of the Key Management Unit (KMU) based on a new PUF module. This component is responsible for the generation and distribution of the cryptographic keys. Security services based on cryptographic mechanisms assume cryptographic keys to be distributed to the communicating parties prior to secure communications.