Data Processing Security Unit Falsification Detection
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Solution Overview
Problem
Existing digital content protection systems are vulnerable to software falsification and data alteration, leading to security breaches and unauthorized use, as they fail to detect changes in software and data processing, resulting in increased costs and decreased product reliability.
Innovation Solution
A data processing apparatus with a security unit that includes an encryption means for decoding encrypted signals, a compression means for compressing access signals, and a comparison means for detecting falsification by comparing the compression result with a previously-obtained expectation value, thereby preventing unjust access and data alteration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a debugger is coupled to the CPU and data is sent directly to the security protection area, then ease of operation for debugging is improved, but security against unjust access deteriorates
Solution Approach 1:
A compression means is introduced as an intermediary component between the CPU and the security protection area. This compression means compresses access signals before they reach the security area, creating an additional layer that prevents direct access and debugger coupling, thereby maintaining security while allowing legitimate debugging operations
2Reliability
If the security protection area is integrated into a single chip, then security against unjust access is improved, but device complexity increases
Solution Approach 1:
The security protection area, compression means, and CPU are integrated into a single chip structure. This merging approach consolidates multiple functions into one unified device, improving security by preventing external debugger access while managing complexity through systematic integration of components
3Measurement precision
If compression means is added to compress access signals, then detection of software falsification is improved, but device complexity increases
Solution Approach 1:
The compression means performs preliminary compression of access signals before they reach the security protection area. By pre-compressing the signals, the system creates a verifiable transformation that can be used to detect falsification, enabling precise detection while managing complexity through proactive signal processing
4Ease of manufacture
If authentication and decryption functions are implemented in software, then ease of manufacture is improved, but vulnerability to falsification increases
Solution Approach 1:
The system replaces pure software authentication and decryption with a hybrid approach that incorporates hardware-based compression means and security protection areas. This substitution of mechanical/hardware elements for software functions reduces vulnerability to falsification while maintaining manufacturability through integrated chip design
Data Source
AI summary
A data processing apparatus is provided, which detects falsification of software to data and rewriting of the data. The data processing apparatus according to an embodiment of the present invention comprises a security unit which has an encryption circuit for decrypting an encrypted signal including secrecy data. The security unit includes a compression circuit which compresses an access signal used in accessing the security unit and outputs the compression result, and a comparison circuit which compares the compression result outputted from the compression circuit with a previously-calculated expectation value of the compression result of the access signal.