Wireless Padding Messages for Obscuring Wi‑Fi Transmission Patterns
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Solution Overview
Problem
Wireless networks, such as Wi-Fi networks, reveal device identity through fixed message sizes and transmission intervals, despite encryption, making it possible to identify transmitting devices in applications like videoconferencing.
Innovation Solution
Implementing padding messages with padding headers and data to obscure transmission periods and sizes by transmitting irrelevant data between actual messages, causing receivers to discard or disregard the padding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fixed-size messages are transmitted at fixed intervals to ensure application quality, then message transmission reliability is improved, but device privacy deteriorates because transmission patterns reveal device identity
Solution Approach 1:
The system performs preliminary action by generating and transmitting padding messages before actual messages are sent. These padding messages are created in advance to establish a deceptive transmission pattern that masks the true message timing and size, thereby protecting device privacy while maintaining reliable message delivery
Solution Approach 2:
Padding messages serve as an intermediary element between the device and the network. These intermediary transmissions absorb attention and mask the characteristics of actual messages, preventing direct observation of transmission patterns that would reveal device identity while allowing reliable communication to proceed
2Object-affected harmful factors
If padding messages are transmitted to obfuscate transmission patterns, then device privacy is improved, but network traffic volume increases
Solution Approach 1:
The system applies local quality by transmitting padding messages selectively at specific intervals rather than continuously. The padding is applied locally to mask particular transmission patterns that would reveal device identity, rather than uniformly increasing all traffic, thereby balancing privacy protection with traffic efficiency
Solution Approach 2:
The system uses partial action by transmitting padding messages only when necessary to mask specific transmission patterns. Rather than continuously transmitting padding to maximize privacy, the system applies padding selectively to achieve sufficient obfuscation while minimizing unnecessary traffic volume
Data Source
AI summary
Described herein is a network that uses padding to obscure transmission period or size. A wireless device performs an operation that includes transmitting, to an access point, a first message at a first time and transmitting, to the access point, a second message at a second time after the first time. A difference between the second time and the first time is a transmission period. The operation also includes generating a padding message comprising a first padding header and first padding data and transmitting, to the access point, the padding message at a third time after the second time. A difference between the third time and the second time is less than the transmission period. The operation further includes transmitting, to the access point, a third message at a fourth time after the third time. A difference between the fourth time and the second time is the transmission period.