Block Acknowledgement Frame Privacy Protection via Encrypted AIDs
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In wireless communication systems, the privacy-related information of a station (STA) is easily tracked by illegal users, leading to serious privacy breaches due to unencrypted identity identifier information such as AIDs in control frames like BA frames, which reveals mapping relationships between AIDs and MAC addresses, compromising user location and service usage data.
Innovation Solution
A communication method and station implementation that encrypts or uses information digest algorithms to protect AIDs within BA frames, allowing only authorized STAs to identify and process intended information by announcing protection capabilities and performing key agreements for secure encryption and decryption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If AID information is transmitted in clear text in BA frames, then communication efficiency is improved, but privacy protection deteriorates
Solution Approach 1:
The patent extracts the AID information from the clear text portion of the BA frame and places it in an encrypted field. Specifically, the AID is encrypted using AES encryption with a key derived from the GCNT value, separating the identifiable information from the readable frame content, thus preventing privacy breaches while maintaining frame structure efficiency
Solution Approach 2:
The patent introduces an intermediary encryption mechanism using GCNT-derived keys to protect AID information. The GCNT value serves as a mediator that generates encryption keys, transforming the AID into an encrypted form that can only be decrypted by authorized parties with the same GCNT, thus bridging the need for identification and privacy protection
2Object-affected harmful factors
If encryption is applied to AID information in BA frames, then privacy protection is improved, but device complexity increases
Solution Approach 1:
The patent performs preliminary key derivation by generating encryption keys from the GCNT value before the actual BA frame transmission. The key derivation process is executed in advance during the association or reassociation phase, so that when the BA frame needs to be encrypted, the encryption key is already available, reducing real-time processing complexity
Solution Approach 2:
The patent changes the encryption parameter by using a dynamically derived key from GCNT instead of a static key. The encryption key is generated by hashing the GCNT value with a predefined algorithm, allowing the system to use simple parameter changes (GCNT updates) to achieve secure encryption without complex key management infrastructure
3Reliability
If AID encryption is implemented, then information security is improved, but ease of operation deteriorates
Solution Approach 1:
The patent implements self-service decryption where each STA uses its own GCNT value to derive the encryption key and decrypt the AID field in received BA frames. The decryption process is autonomous and does not require external key distribution or complex authentication protocols, simplifying operation while maintaining security
Solution Approach 2:
The patent inverts the traditional approach by having the receiver generate the decryption key from its own GCNT value rather than receiving the key from the transmitter. This inversion simplifies the operation because each station independently generates its own key material, eliminating the need for complex key management and making the process more straightforward
Data Source
AI summary
Provided is a communication method. The method includes: receiving, by a first station (STA), a block acknowledgement (BA) frame, wherein the BA frame carries first information and/or protected privacy-related information, the first information being configured to identify the protected privacy-related information.