Protected GCR Block Acknowledgment for Secure Groupcast
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Solution Overview
Problem
Existing wireless communication protocols, such as IEEE 802.11, do not adequately protect group-addressed frames like GCR, making them vulnerable to attacks that can cause data loss and frame ordering issues.
Innovation Solution
Implementing protected GCR block acknowledgment requests (GCR BAR) with reserved bits, packet numbers, and message integrity checks to secure groupcast communication, and managing eMLSR links to ensure reliable and predictable operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If protection is added to control frames and MAC headers of unicast data and management frames, then security of unicast communication is improved, but group-addressed frames remain vulnerable to attacks
Solution Approach 1:
The patent extends the protection mechanism originally designed for unicast frames to group-addressed frames by incorporating group address fields and groupcast-specific parameters into the existing protected frame structure. This allows a single protection framework to serve both unicast and groupcast communication needs, resolving the contradiction between improving unicast security and maintaining adaptability for group-addressed frames.
2Object-affected harmful factors
If fake GCR MU-BAR or data is injected with invalid sequence number, then attackers can move the block acknowledgment window and cause data loss, but the system lacks mechanisms to detect and prevent such attacks
Solution Approach 1:
The patent implements preliminary validation of sequence numbers and block acknowledgment window parameters before processing GCR BAR frames. By checking whether the sequence number falls within the expected range and verifying the integrity of the block acknowledgment window movement, the system prevents attackers from injecting fake frames with invalid sequence numbers that could manipulate the acknowledgment window and cause data loss.
3Object-affected harmful factors
If the scoreboard and reorder buffer are corrupted by invalid sequence numbers, then frame ordering is disrupted and content recovery is obstructed, but no validation mechanism exists to prevent corruption
Solution Approach 1:
The patent applies preliminary anti-action by implementing validation checks that prevent invalid sequence numbers from corrupting the scoreboard and reorder buffer. The system verifies sequence number integrity before allowing updates to these critical data structures, thereby preemptively blocking the attack vector that would otherwise disrupt frame ordering and prevent content recovery.
Data Source
AI summary
An electronic device is described. This electronic device can include: an antenna node communicatively coupled to an antenna; and an interface circuit, communicatively coupled to the antenna node, that communicates with a second electronic device. During operation, the interface circuit can provide, addressed to at least the second electronic device, a groupcasting with retries (GCR) block acknowledgment request (BAR), where the GCR BAR indicates that the GCR BAR is protected. Note that the GCR BAR can include a GCR multi-user BAR (MU-BAR). Moreover, the indication can be included in a reserved bit in the GCR BAR. For example, the reserved bit can include bit 0 or at least one of bits 5-11 in a BAR control field. Furthermore, the GCR BAR can indicate a key identifier using the reserved bit.