Detecting Compromised Private Keys via Identity Comparison
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Solution Overview
Problem
In large networks, the exposure of a certificate authority's private key can lead to compromised security, as malicious entities can forge digital signatures and create false certificates, compromising trust and potentially leading to 'man in the middle' attacks.
Innovation Solution
A method and system for detecting compromised private keys by comparing identities associated with certificates and private keys within a keystore, generating notifications and revocation requests when a match is found, thereby ensuring non-trusted certificates are not trusted.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If certificate authorities deploy public keys with software, then trust establishment is improved, but private keys may be mistakenly deployed along with public keys, causing security compromise
Solution Approach 1:
The system performs preliminary detection by comparing the identity of the certificate authority in the certificate with the identity of the entity holding the private key before allowing certificate validation. This preliminary check prevents the security issue from manifesting in actual certificate verification operations.
Solution Approach 2:
The system implements a feedback mechanism where the detection result (match or mismatch between certificate authority identity and private key holder identity) directly influences whether the certificate is trusted or rejected. This feedback loop ensures that compromised certificates are automatically identified and excluded from trust validation.
2Productivity
If employees deploy key pairs without full understanding, then deployment speed is improved, but private keys may be exposed, compromising certificate authority security
Solution Approach 1:
The system enables self-service security verification by automatically comparing identities without requiring employee understanding of cryptographic concepts. The detection mechanism performs the security check autonomously, eliminating the need for employees to comprehend the distinction between public and private key deployment requirements.
Solution Approach 2:
The identity comparison mechanism acts as an intermediary that mediates between the deployment process and security validation. Instead of relying on employee knowledge, the system introduces an automated intermediary check that verifies whether the private key holder identity matches the certificate authority identity, blocking potential security breaches regardless of employee understanding.
3Object-generated harmful factors
If malicious third parties obtain private keys, then they can forge digital signatures and create false certificates, but detection mechanisms can identify compromised keys by comparing identities
Solution Approach 1:
The system performs preliminary identity verification by comparing the certificate authority identity with the private key holder identity before allowing certificate validation. This preliminary detection prevents forged certificates from being accepted, even if malicious parties have obtained private keys through unauthorized means.
Solution Approach 2:
The system implements a feedback mechanism where the identity comparison result directly determines certificate trust status. When a match is detected between certificate authority identity and private key holder identity, the system provides feedback that the certificate should be rejected, thereby maintaining reliability despite the presence of potential forgeries.
Data Source
AI summary
A system and method can include comparing entities associated with public certificates and private keys in a keystore to detect compromised private keys. This increases security of systems implementing public key cryptography over a network. The comparison can be triggered by a trigger event in one embodiment. If a private key belonging to a certificate authority is detected, a notification can be generated. Alternatively or in addition, a revocation request can be generated for public certificates corresponding to the compromised private key.