Client Device Broadcast Message Integrity Verification
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Solution Overview
Problem
Conventional communication networks, particularly mobile networks, lack effective protection for broadcast messages against tampering and replay attacks, leading to vulnerabilities in message integrity, uniqueness, and freshness.
Innovation Solution
A client-side electronic device and a central signing server are implemented to receive and protect broadcast messages. The device verifies the integrity and freshness of messages using digital signatures and timestamps, while the signing server computes digital signatures over broadcast messages and timestamps, ensuring message protection and client-side verification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional broadcast messaging is used without digital signatures, then device complexity and processing overhead are reduced, but message integrity and reliability are compromised
Solution Approach 1:
The patent applies preliminary action by having the server compute digital signatures over broadcast messages and timestamps before transmission. The client device then verifies these pre-computed signatures, which simplifies the client-side operation while ensuring message integrity. The signature computation is performed in advance by the server, not during client reception.
Solution Approach 2:
The patent introduces digital signatures as an intermediary mechanism between the server and client. The signature acts as a mediator that provides cryptographic proof of message authenticity and integrity without requiring complex trust verification between the server and client devices. The signature mediates the trust relationship through mathematical verification.
2Reliability
If timestamps are used for freshness verification, then message uniqueness is improved, but clock synchronization requirements increase system complexity
Solution Approach 1:
The patent applies preliminary action by having the server compute a digital signature over the timestamp in advance, before the client receives the message. This pre-signing of the timestamp eliminates the need for complex clock synchronization between server and client, as the signed timestamp serves as a trusted reference that the client can verify independently using the server's public key.
Solution Approach 2:
The patent introduces the signed timestamp as an intermediary that mediates between the server's time reference and the client's verification process. Instead of requiring direct clock synchronization, the signed timestamp acts as a trusted intermediary that provides cryptographic evidence of when the message was generated, allowing the client to verify freshness without synchronizing its clock with the server.
3Reliability
If digital signatures are computed over both message and timestamp, then protection against replay attacks is improved, but processing overhead increases
Solution Approach 1:
The patent applies segmentation by separating the signature computation into two distinct parts: a signature over the message content and a signature over the timestamp. This segmentation allows the client to verify each component independently and enables optimization where the timestamp signature can be pre-computed or cached, reducing overall computational overhead while maintaining comprehensive replay attack protection.
Solution Approach 2:
The patent applies preliminary action by having the server pre-compute and include the timestamp signature in the broadcast message. This allows the client device to verify replay protection without needing to perform the computationally intensive timestamp signing operation itself, reducing the client's energy consumption while maintaining strong security guarantees.
Data Source
AI summary
A client-side electronic device includes a receiver, a processor, and a memory. The receiver communicates with a message server over a communication medium of a communication network. The memory stores computer-executable instructions, which, when executed by the processor, cause the device to receive, from the message server, a broadcast message, a timestamp associated with the broadcast message, and a first digital signature of the broadcast message and a second digital signature of the timestamp. The executed instruction further cause the device to verify an integrity of the broadcast message based the first or second digital signatures, determine a freshness of the broadcast message based on the received timestamp, calculate a trust state of the broadcast message based on the integrity verification and the freshness determination, and store the broadcast message in the memory along with the calculated trust state.