Pseudo-random frame sequencing for secure mobile display privacy
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Solution Overview
Problem
Existing alternate frame sequencing (AFS) methods for securing private information on mobile devices are inadequate, as simple sequences can be compromised by unauthorized viewers with shutter glasses, and there is a need for enhanced security and flexibility in displaying sensitive information in various environments and to multiple viewers with different clearance levels.
Innovation Solution
The system employs a mobile device and viewing device synchronized using pseudo-random frame sequences and environmental parameters to ensure only authorized users can view private information, with the ability to display different content to multiple viewers based on their clearance levels and adapt to changing security environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If simple alternate frame sequencing is used to display private information, then the system is easy to implement, but security is compromised by unauthorized viewers with shutter glasses
Solution Approach 1:
The patent applies dynamics by transitioning from static, predetermined frame sequences to dynamic, pseudo-random frame sequences that change over time. The frame sequences are generated using pseudo-random number generators seeded with environmental parameters, making the display pattern unpredictable and adaptive to changing conditions, thereby enhancing security while maintaining implementation feasibility
Solution Approach 2:
The patent changes the parameter of frame sequence predictability by using pseudo-random generation based on environmental parameters (temperature, humidity, pressure, etc.). This transforms the frame sequencing from a fixed, easily guessed pattern to a dynamic pattern that varies with environmental conditions, significantly improving security without requiring complex hardware modifications
2Reliability
If AFS is used to secure private information, then privacy is protected, but flexibility to display different content to multiple viewers with different clearance levels is reduced
Solution Approach 1:
The patent applies segmentation by dividing the display content into multiple layers or channels with different security clearances. Different frame sequences can be assigned to different content segments, allowing authorized viewers with specific clearance levels to access appropriate content while maintaining privacy protection for sensitive information
Solution Approach 2:
The patent achieves multi-functionality by enabling a single AFS system to serve multiple viewers with different clearance levels simultaneously. The system can display different content or different levels of content detail to different authorized users based on their credentials, making the system universally applicable to various security requirements without sacrificing privacy protection
3Reliability
If synchronized viewing devices are used to enable authorized viewing, then security is improved, but device complexity increases
Solution Approach 1:
The patent applies self-service by enabling viewing devices to automatically synchronize with the display using environmental parameters as shared secrets. The devices independently generate the same pseudo-random frame sequences by reading environmental sensor data, eliminating the need for complex manual synchronization procedures or centralized control mechanisms
Data Source
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AI summary
Private information can be displayed using alternate frame sequencing to prevent unauthorized viewing. The private information can be ascertained by an authorized user using an active shutter viewing device synchronized to the alternate frame sequencing display. Private information can be displayed on a portion of the display, while public information, including a basic user interface, can be displayed on a second portion visible to authorized and unauthorized users. For enhanced security, alternate frame sequencing synchronization parameters can be encrypted and exchanged between a display device and the viewing device. When and where to display private information using alternate frame sequencing can be determined using environmental sensors. A single display screen can be configured to simultaneously present private information to multiple users, each user permitted to view a portion of the private information according to the unique synchronization parameters employed by a user's viewing device.