Signature Verification Device Security Strength Comparison

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Solution Overview

Problem

Existing signature verification and encryption technologies face challenges in ensuring security strength when algorithms are compromised, leading to potential unauthorized software updates and data breaches.

Innovation Solution

A signature verification device and encryption processing device that compare the security strength of received files with previously received files, executing processing only when the security strength is higher, thereby preventing unauthorized file utilization even if the algorithm is compromised.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If signature verification and encryption technologies are used to ensure security, then security strength is improved, but vulnerability to algorithm compromise and unauthorized access increases

Engineering Contradiction:

Improvesecurity strengthVSAvoidvulnerability to algorithm compromise

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent implements dynamic security verification by continuously comparing the security strength of received signatures against currently stored security strength information. This dynamic approach allows the system to adapt to evolving security threats and algorithm compromises by updating security strength information and rejecting files that do not meet current security standards, thereby resolving the contradiction between maintaining security and preventing vulnerability to algorithm compromise.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent applies preliminary action by pre-storing security strength information from trusted sources before receiving files. This preliminary preparation enables the system to quickly verify and reject potentially compromised signatures without real-time analysis, improving both security response time and the ability to prevent unauthorized access while maintaining system reliability.

Inventive Principle:

Principle #10Preliminary action

2Reliability

If security verification processing is executed for all received files, then security is improved, but processing time and system complexity increase

Engineering Contradiction:

Improvesecurity verificationVSAvoidprocessing time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent implements partial action by performing security verification only on files where the signature's security strength is lower than the stored security strength information. Files with equal or higher security strength are processed without additional verification, reducing processing time while maintaining security. This selective verification approach resolves the contradiction between thorough security checking and efficient processing.

Inventive Principle:

Principle #16Partial or excessive action

Solution Approach 2:

The patent changes the verification parameter from checking all files to comparing security strength values. By transforming the verification process into a parameter comparison (security strength of received signature vs. stored security strength), the system achieves faster processing while maintaining security, as the comparison operation is computationally efficient compared to full cryptographic verification of every file.

Inventive Principle:

Principle #35Parameter changes

3Reliability

If security strength comparison is performed on every received file, then security strength is improved, but device complexity increases

Engineering Contradiction:

Improvesecurity strengthVSAvoidverification system complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent extracts the security strength information from the signature verification process and stores it separately as reference data. This extraction simplifies the verification system by separating the security strength reference (stored externally) from the verification logic (comparing signature strength against stored reference), reducing device complexity while maintaining security strength verification capabilities.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent introduces security strength information as an intermediary element between the signature and the verification decision. This intermediary contains pre-analyzed security strength data that mediates the verification process, allowing the system to make security decisions based on comparing this intermediate data rather than performing complex cryptographic analysis, thereby reducing device complexity while preserving security.

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS20240354394A1Signature verification device, signature verification method, storage medium storing signature verification program, and encryption processing device

Publication Date: 2024.10.24 DENSO CORP

AI summary

A signature verification device is configured to receive a file and a signature, compare a first security strength, which is a security strength of the signature, with a second security strength, and execute processing for utilizing the file. The signature verification device is configured to execute processing for utilizing the file when the first security strength is higher than the second security strength, and not execute the processing for utilizing the file when the first security strength is lower than the second security strength.