Tamper-Proof Camera Log Using Cryptographic Hash Chains
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Solution Overview
Problem
Current digital data management systems lack reliable indicators of integrity, particularly in cross-organizational settings, making it difficult to ensure the trustworthiness and accountability of digital audio, image, and video data used by government and law enforcement agencies.
Innovation Solution
A method and apparatus for maintaining a tamper-proof camera log by embedding a chain of log entries within a device, with at least one log entry published externally, using cryptographic hash functions to authenticate media data and metadata, ensuring the integrity of captured media and metadata.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If digital data is stored and managed in conventional systems, then data accessibility and ease of operation are improved, but data integrity and reliability deteriorate due to lack of tamper-proof mechanisms
Solution Approach 1:
The log file is segmented into individual log entries, each containing a hash of the media file and a hash of the previous log entry, creating a chain structure where each segment depends on the previous one, making tampering detectable while maintaining overall accessibility
Solution Approach 2:
A hash function acts as an intermediary mechanism that transforms media file data into a fixed-size hash value, which is then embedded in the log entry. This intermediary provides a reliable link between the media data and the log record without exposing the actual media content, ensuring integrity while maintaining accessibility
2Reliability
If cryptographic hash functions are used to authenticate media data, then data integrity and reliability are improved, but device complexity and computational requirements increase
Solution Approach 1:
The patent uses hash values (cryptographic fingerprints) as disposable representations of media files. Instead of storing or processing the actual large media files for authentication purposes, only their compact hash values are stored in the log entries. These hash objects are computationally inexpensive to generate and store, providing reliable authentication without significant device complexity
Solution Approach 2:
The patent replaces complex physical security mechanisms with cryptographic hash functions. Instead of using hardware-based tamper-proofing or physical seals, the system uses mathematical hash functions to provide tamper detection, significantly reducing device complexity while maintaining or improving reliability
3Reliability
If log entries are published externally for verification, then accountability and auditability are improved, but loss of information increases due to potential exposure of sensitive data
Solution Approach 1:
The patent extracts only the essential verification information (hash values and log entry data) from the complete media files and publishes them externally. The actual sensitive media content remains private and is never exposed in the published log. This extraction provides accountability through verifiable hashes while preventing loss of sensitive information
Solution Approach 2:
The patent applies different quality levels to different parts of the data structure. The log entries contain full hash information for verification purposes, while the actual media files maintain their original quality and sensitivity. This local differentiation allows external publication of verification data without exposing sensitive content, balancing accountability and privacy
Data Source
AI summary
A method and apparatus for maintaining a tamper proof device log are described. In one embodiment, the method comprises maintaining an embedded log in the device, the embedded log being a chain of log entries. In one embodiment, the method may also comprise publishing at least one log entry to a location external to the device.