Information Signal Integrity Verification via Component Segmentation
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Solution Overview
Problem
Existing integrity check methods for information signals, such as digital audio or video, require testing the entire dataset, making it complex and unable to allow non-characteristic changes like adding watermarks without disrupting the integrity check.
Innovation Solution
A device and method that extracts and encrypts only the characteristic information of an information signal, using cryptographic methods like SHA-1, allowing non-characteristic changes without affecting the integrity check by masking out non-characteristic parts and applying the hash method only to the scaling factors or side information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the entire dataset is tested by the hash algorithm for integrity check, then the integrity verification is comprehensive, but the complexity increases and non-characteristic changes cannot be made
Solution Approach 1:
The patent segments the information signal into characteristic components (side information) and non-characteristic components (main information). Only the characteristic components are subjected to hash algorithm processing for integrity verification, while non-characteristic components can be modified without affecting the integrity check. This segmentation resolves the contradiction by making the verification process focused and efficient.
Solution Approach 2:
The patent extracts only the characteristic components (side information) from the entire information signal for integrity verification. By taking out only the essential parts that need protection, the hash algorithm processes a smaller dataset, reducing complexity while maintaining reliable integrity verification for the critical portions.
2Reliability
If the entire dataset is tested by the hash algorithm, then all changes are detected, but adding watermarks or making non-characteristic changes destroys the integrity
Solution Approach 1:
The patent divides the information signal into characteristic components that require integrity protection and non-characteristic components that can be freely modified. This segmentation allows watermarks and other non-characteristic changes to be made without destroying integrity, while still detecting actual manipulations of the characteristic parts.
Solution Approach 2:
The patent applies different treatment to different parts of the information signal: characteristic components (side information) are protected with hash verification, while non-characteristic components (main information) are allowed to be modified. This local differentiation resolves the contradiction between detecting all changes and allowing necessary modifications.
3Reliability
If cryptographic hash functions process the complete information signal, then the security is high, but the processing time and computational resources increase
Solution Approach 1:
The patent extracts only the characteristic components (side information) from the complete information signal for hash processing. This extraction reduces the amount of data subjected to computationally intensive cryptographic operations, thereby reducing processing time and resource consumption while maintaining security for the essential parts.
Solution Approach 2:
Instead of applying the hash algorithm to the entire information signal (excessive action), the patent applies it only to the necessary characteristic components (partial action). This partial processing maintains adequate security for the critical elements while significantly reducing computational overhead and processing time.
Data Source
AI summary
The present invention relates to a device for detecting a manipulation of an information signal, having an extractor for extracting an information signal component characteristic for the information signal from the information signal, an encryptor for encrypting the information signal component to obtain an encrypted signal, and a comparator for comparing the encrypted signal to a reference signal, wherein the reference signal is an encrypted representation of a non-manipulated reference signal component of a reference information signal to detect the manipulation.