2 results about "Key-agreement protocol" patented technology

The application provides a data security encryption method and a smart wearable device, and the method comprises the following steps: performing a hash operation based on a current timestamp and a shared key to obtain a first key seed, performing a hash operation based on the first key seed and a data sequence to be transmitted to determine a second key seed; determining a mapped key symbol sequence based on the second key seed and a preset ring modulus, mapping the data sequence to be transmitted in the preset ring modulus to obtain a data symbol sequence; calculating a Lee distance bit by bit based on the mapped key symbol sequence and the data symbol sequence to obtain a Lee distance sequence, encrypting the Lee distance sequence and the mapped key symbol sequence on the preset ring modulus based on the Lee distance sequence to obtain an encrypted ciphertext symbol sequence; and generating a transmission data packet based on the encrypted ciphertext symbol sequence and the current timestamp and sending the transmission data packet to a receiving end. The application realizes the dynamic key and the anti-cracking capability without relying on a complex key agreement protocol, and improves the data transmission security.

This invention discloses a decentralized key negotiation method and system for weak network environments, comprising: discovering a set of devices participating in the negotiation, including statically configured neighboring devices and online devices dynamically discovered through multicast; determining the negotiation initiator based on the IP address of each device; exchanging negotiation messages with the target device, executing a key negotiation protocol for a preset number of rounds, generating a shared key using the elliptic curve Diffie-Hellman algorithm, and performing bidirectional key consistency verification using message verification codes; during the key negotiation process, performing immediate retransmission of negotiation messages based on sequence numbers and selective acknowledgment mechanisms, and dynamically adjusting the retransmission timeout threshold according to the round-trip time. This invention achieves efficient and reliable key negotiation between cryptographic devices in weak network environments without relying on a central coordinator, significantly improving the negotiation success rate and transmission efficiency.