Digital Signature Verification for Content Code Integrity
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Solution Overview
Problem
Existing digital content protection methods, such as encryption, are inadequate in preventing unauthorized copying and usage due to potential leaks of secret keys, leading to unauthorized decryption and reproduction of content.
Innovation Solution
Implementing a system that includes a data processing unit for executing verification processing of digital signatures and content codes, which allows for tampering verification and secure data processing, ensuring the validity of content codes before data processing, and utilizing a content code file generating mechanism to record content codes with digital signatures for secure content use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If encryption processing is applied to content, then unauthorized copying is prevented, but secret key leakage still allows unauthorized decryption
Solution Approach 1:
The content is divided into multiple segments with different protection levels. Some segments are protected with encryption while others use dummy data. This segmentation allows the system to provide different degrees of protection for different parts of the content, reducing the impact of key leakage on the entire content.
Solution Approach 2:
A content code file with digital signature acts as an intermediary between the content and the reproduction device. This intermediary verifies the legitimacy of reproduction through signature validation, adding an additional layer of security that is independent of the encryption keys.
2Reliability
If dummy data replacement is implemented, then unauthorized reproduction is prevented, but data transformation processing complexity increases
Solution Approach 1:
Dummy data replacement and digital signature verification are performed in advance during the content preparation stage. This preliminary action ensures that protection mechanisms are already in place before reproduction occurs, simplifying the reproduction process while maintaining security.
Solution Approach 2:
The content code file containing digital signatures is copied along with the content. This copying mechanism allows the verification information to be readily available during reproduction without requiring complex real-time generation or external validation processes.
3Adaptability or versatility
If content codes are recorded independently, then flexibility in moving and copying is improved, but risk of content code leakage and unauthorized usage increases
Solution Approach 1:
The content code file is created as a composite structure combining content codes with digital signatures. This composite format maintains the independence and mobility of content codes while embedding verification mechanisms that prevent unauthorized usage even if the codes are leaked or copied.
Solution Approach 2:
Digital signatures provide feedback verification for content code validity. When content codes are moved or copied, the signature verification process checks their legitimacy, creating a feedback loop that prevents unauthorized usage while maintaining the flexibility of independent content code recording.
Data Source
AI summary
An information processing device for executing reproduction processing of content recorded in an information recording medium, includes: a data processing unit for acquiring content codes including a program or application information to be applied to the recording content of the information recording medium, and executing data processing in accordance with the acquired content codes; wherein the data processing unit is configured so as to execute the verification processing of a digital signature which allows tampering verification of the entire content codes included in a content code file storing the content codes, and as the verification result, execute data processing in accordance with the content codes on the condition that validity of the content code file has been confirmed.