Secure Content Delivery via Hashed Pre-Coded Packets
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Solution Overview
Problem
Dedicated short range communications (DSRC) networks face challenges in securely delivering a certificate revocation list (CRL) to vehicles, as existing methods fail to prevent malicious or incorrect packets from being forwarded, compromising network security.
Innovation Solution
The method involves coding and hashing packets using a determined code, transmitting hashes via the network, and verifying them using electronic signatures or encryption to ensure secure content delivery, allowing vehicles to identify untrustworthy senders and securely disseminate the CRL.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If packets are transmitted without hashing and verification, then transmission speed is high, but network security deteriorates allowing malicious packets to be forwarded
Solution Approach 1:
The patent applies preliminary action by pre-computing and transmitting hashes of coded packets along with the coded packets themselves. This allows receiving vehicles to quickly verify packet integrity without performing complex decoding operations, thus enhancing security while maintaining processing efficiency. The hash values are prepared in advance before transmission.
Solution Approach 2:
The patent uses cryptographic hashes as an intermediary mechanism to verify packet integrity. Instead of requiring vehicles to directly verify the authenticity of complex coded packets, the hash values serve as simplified intermediaries that can be easily computed and compared, providing security without excessive processing complexity.
2Reliability
If all coded packets are transmitted to ensure complete CRL delivery, then content delivery completeness is improved, but network overhead increases
Solution Approach 1:
The patent implements partial action by transmitting a subset of coded packets rather than all possible packets. Since the system uses erasure coding where any k packets out of m total packets can reconstruct the original CRL, the system can stop transmission once a receiving vehicle collects sufficient packets, avoiding unnecessary transmission of excess packets and reducing network overhead.
Solution Approach 2:
The system employs feedback mechanisms where receiving vehicles monitor the collection of coded packets and can signal when they have obtained sufficient packets for reconstruction. This feedback allows the transmitting vehicle to cease transmission, ensuring complete content delivery while minimizing network overhead by avoiding redundant packet transmissions.
Data Source
AI summary
Methods, systems, and devices are described for securing content for delivery via a communications network. The methods, systems and devices may involve coding a plurality of packets using a determined code to generate a coded set of packets. A plurality of packets of the coded set of packets may be hashed to generate a plurality of hashes. The plurality of hashes may be transmitted via the communications network to deliver the secured content.