Research on a Dynamic Transfer Protocol for Multi-owner Tag Ownership

Tags may have multiple owners with different weights, and some owners may sell their own partial weights to other owners in practical applications. The proportion of shares owned by different owners may also change in the cycle of ownership transfer, so it is necessary to be able to convert ownership and update the key value dynamically. This paper proposes a Lagrangian-based RFID tag ownership dynamic conversion protocol to achieve multi-owner ownership transfer with different weights to solve this problem. When the owner's weight changes, according to the condition that the sum of the owner weights of the participating recovery keys is equal to or greater than the value t, the agreement restores the legality of the original key verification owner. The secret key is used to divide the new key into n shares, and the subkey is distributed based on the owner's new weight value. This way enhances the flexibility of the tag in the security and practical use of ownership transfer.