Drone Beacon Authentication Using Compact Certificate Broadcasts
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Solution Overview
Problem
Existing communication systems face challenges in implementing certificate-based security for constrained devices due to message size constraints, communication channel bandwidth limitations, and connection unreliability, particularly in broadcasting drone identification messages, which are not supported by conventional certificates like X.509.
Innovation Solution
Implementing asymmetric cryptographic authentication using IEEE 1609.2 certificates and implicit format certificates to sign beacon type messages, enabling secure authentication of small size messages (up to 125 bytes) without network connectivity, leveraging IEEE 1609.2's small certificate sizes and Elliptic Curve Digital Signature Algorithm (ECDSA) for Bluetooth and Wi-Fi beacons.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional certificates like X.509 are used for drone authentication, then security is improved, but message size constraints and bandwidth limitations are violated
Solution Approach 1:
The authentication process is segmented into two parts: a lightweight certificate identifier (CI) is embedded in the beacon message, while the full certificate verification occurs separately through ECDSA signature validation. This segmentation allows security to be maintained without embedding large certificate data in constrained beacon messages.
Solution Approach 2:
The patent extracts only the essential certificate identifier from the full certificate structure, separating it from the beacon message payload. The complete certificate verification is performed externally using the ECDSA algorithm, removing the burden of large certificate data from the constrained broadcasting message.
2Reliability
If certificate-based security is implemented in broadcasting, then authentication reliability is improved, but communication channel bandwidth is consumed
Solution Approach 1:
The patent changes the parameter of certificate representation from full certificate data to a compact certificate identifier. This parameter change reduces the data size from hundreds of bytes to a minimal identifier, enabling certificate-based authentication in bandwidth-constrained broadcast channels while maintaining security through ECDSA verification.
3Reliability
If full certificate verification is performed in beacon messages, then authentication integrity is improved, but message size constraints are exceeded
Solution Approach 1:
The authentication mechanism is segmented so that the beacon message contains only a compact certificate identifier, while the computationally intensive ECDSA verification process occurs separately. This segmentation allows the beacon message to remain within size constraints while still providing robust authentication through external verification.
4Reliability
If connection unreliability is addressed by retransmission, then communication reliability is improved, but message size constraints and bandwidth limitations worsen
Solution Approach 1:
The patent implements a self-service authentication mechanism where the receiver independently verifies the ECDSA signature using the certificate identifier and public key, without requiring retransmission or additional communication rounds. This self-verification approach maintains communication reliability while avoiding the overhead of retransmission protocols.
Data Source
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AI summary
Various embodiments enable broadcast communications security. Various embodiments enable the authentication of broadcast communications. Various embodiments may enable asymmetric authentication and integrity protection of small size messages, such as one or more signed messages totaling a length of 250 bytes or less. Various embodiments may support cryptographic signing of beacon type messages using certificates. Various embodiments may include generating a beacon type message, cryptographically signing the beacon type message at least in part using a certificate to generate a signed beacon message, and sending the signed beacon type message in one or more broadcast transmissions in conjunction with, or independently of, certificate information used to verify the signed beacon message.