Low power device with encryption

A system for secure communication in a low power device that communicates with small payloads, comprising:

• the low power device that communicates with small payloads;
• a server in communication with the low power device that communicates with small payloads, the server having a handshake key (Kh) with a key exchange that provides for a communication session between a mobile device and the low power device, wherein the mobile device does not have the (Kh);
• and
• the mobile device configured to communicate with the server and using a cipher to provide a secured communication between the mobile device and the low power device, wherein a communication is initialized by generating a session nonce (Ns) on the mobile device, the (Kh) is a shared secret known to the low power device and to an entity encrypting the nonce that includes the server, the low power device modifies the nonce and returns a modified value to the mobile device, an entity with the server has the (Kh), decrypts a session key and the mobile device uses that to encrypt subsequent communication, wherein the low power device generates the session (Kh) and provides for secure communication and when the low power device is assembled, and at least one random number is provisioned on the mobile device.