Client Device Message Integrity and Freshness 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 digital signature and timestamp of received messages, while the signing server computes and transmits digital signatures and timestamps to ensure message integrity and freshness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional broadcast messaging is used without digital signatures and timestamps, then the system complexity is low and ease of operation is maintained, but message integrity, uniqueness, and freshness cannot be guaranteed, making the system vulnerable to spoofing and replay attacks
Solution Approach 1:
The system performs preliminary actions by pre-computing digital signatures at the server side before message transmission and pre-synchronizing timestamps. This ensures that when messages are broadcast, they already contain integrity protection and timing information, eliminating the need for complex client-side verification mechanisms and achieving reliability without increasing client device complexity
Solution Approach 2:
The patent introduces an intermediary authentication mechanism where the server acts as a trusted mediator that signs messages with digital signatures and embeds timestamps. This intermediary layer provides cryptographic proof of message authenticity and freshness without requiring direct trust relationships between all network participants, resolving the contradiction between reliability and complexity
2Reliability
If timestamp-based replay attack prevention is implemented, then message freshness is improved, but the system becomes vulnerable when client and server clocks are not synchronized or when clocks are compromised
Solution Approach 1:
The system changes the parameter used for replay attack prevention from relying solely on client-server clock synchronization to using server-side generated timestamps that are cryptographically signed. This parameter change makes the freshness verification independent of client clock accuracy and resistant to clock compromise, as the signed timestamp serves as authoritative proof of message timing
Solution Approach 2:
The patent applies preliminary anti-action by having the server pre-sign timestamps along with messages before transmission. This creates a cryptographic binding between the message content and its timing information, preventing attackers from replaying old messages even if they intercept timestamps, because the signed timestamp-message pair cannot be separated or reused
3Reliability
If digital signatures are applied to broadcast messages, then message integrity is protected, but the system becomes vulnerable to replay attacks where legitimately signed messages are re-broadcast by false base stations
Solution Approach 1:
The patent merges two security mechanisms into a unified protection scheme: digital signatures for integrity and signed timestamps for freshness. By combining these elements where the timestamp is cryptographically bound to the message content through the same signature operation, the system ensures that a replayed message would have its timestamp exposed, allowing receivers to detect and reject replay attacks while maintaining integrity protection
4Reliability
If multiple message servers are used for broadcast messaging, then system reliability and coverage are improved, but it becomes difficult to ensure consistency and trustworthiness of messages from different servers
Solution Approach 1:
The patent implements a universal trust model where all message servers use the same cryptographic verification process for signed messages and timestamps. This multi-functional approach allows any server's signed messages to be verified by any client using the same public key infrastructure, providing consistent trust verification across the entire network without requiring server-specific verification logic or increasing client complexity
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.