Systems and methods for efficient key management in a vehicular intranet

A system for tree-based key management inside a vehicle, the system comprising:

• a processor;
• a memory storing a tree structure including a plurality of nodes representing a plurality of modules inside the vehicle and processor-executable instructions for the tree-based key management, the processor-executable instructions being executed by the processor to:
• compute a first group key and a first blinded key for a first leaf node from the plurality of nodes based at least in part on a multiplication operation defined in an ecliptic curve group;
• and
• compute, recursively, a second group key and a second blinded key for a non-leaf node from the plurality of nodes based at least in part on a key derivation function and the multiplication operation involving a third group key and a third blinded key corresponding to nodes that are one level down from the non-leaf node.

An apparatus with tree-based key management, comprising:

• a plurality of modules that are communicatively interconnected;
• a memory storing a tree structure having a plurality of nodes corresponding to the plurality of modules;
• a processor communicatively coupled to the plurality of modules and the memory, the processor configured to:
• compute a first group key and a first blinded key for a first leaf node from the plurality of nodes based at least in part on a multiplication operation defined in an ecliptic curve group;
• and
• compute, recursively, a second group key and a second blinded key for a non-leaf node from the plurality of nodes based at least in part on a key derivation function and the multiplication operation involving a third group key and a third blinded key corresponding to nodes that are one level down from the non-leaf node.