Multi-Root Certificate Authority Binding for X.509 Security
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Solution Overview
Problem
Current cryptography systems lack a convenient method for detecting tampering when one of the root certificates is compromised, especially with the advent of quantum computing, which can potentially reduce the time required to compromise certificates, and there is a need for cross-compatible solutions with existing X.509 standard systems to maintain trust between certificate authorities.
Innovation Solution
The solution involves generating root certificates that include identifiers and digital signature algorithms from multiple root certificate authorities, allowing for the binding of these authorities using extensions in the certificates, enabling trust across different digital signature schemes and ensuring that both schemes must be compromised to produce a forged certificate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional single-root certificate authority structures are used, then system simplicity is maintained, but security vulnerability increases when a root key is compromised
Solution Approach 1:
The patent merges multiple root certificate authorities into a single certificate structure by embedding extensions from multiple root CAs within one certificate. This combining approach creates a multi-root bound certificate that provides enhanced security through multiple signature schemes while maintaining a unified certificate format that doesn't significantly increase structural complexity
Solution Approach 2:
The patent creates a composite certificate structure that combines elements from different root certificate authorities using different digital signature schemes (e.g., RSA and ECDSA). This composite approach ensures that compromising one root key does not compromise the entire system, as the certificate requires multiple signature schemes to be broken simultaneously
2Reliability
If quantum-resistant algorithms are adopted, then future security is improved, but compatibility with existing X.509 systems deteriorates
Solution Approach 1:
The patent creates a universal certificate structure that can accommodate multiple digital signature schemes including both traditional algorithms (RSA, ECDSA) and quantum-resistant algorithms. The X.509v3 extension mechanism is leveraged to embed multiple key identifiers and signature algorithm identifiers, allowing the same certificate format to serve multiple security paradigms and maintain compatibility with existing X.509 infrastructure
Solution Approach 2:
The patent utilizes parameter changes within the existing X.509 certificate framework by modifying the extension fields to include multiple key identifiers (keyIdentifier extension) and signature algorithm identifiers (signatureAlgorithm extension). This allows the system to support different signature schemes without changing the fundamental certificate structure, maintaining backward compatibility while enabling future security algorithms
3Reliability
If cross certificates are issued between root CAs, then trust is established, but detection of tampering becomes difficult when one root is compromised
Solution Approach 1:
The patent implements a feedback mechanism where the bound root certificate contains embedded extensions from multiple root CAs that can be used to verify the authenticity of issued certificates. The certificate validation process checks against multiple root keys, providing feedback that enables detection of tampering by any single root, as the bound certificate maintains references to all original root authorities
Data Source
AI summary
Root certificates generated by root certificate authorities may be bound at the time of generation. In an example, a first root certificate can include an identity of a first root certificate authority, a first key identifier associated with a first key of the first root certificate authority and an identity of a first digital signature algorithm used by the first root certificate authority. The first root certificate can also include at least one extension including a second key identifier of a second key associated with the second root certificate authority and an identity of a second digital signature algorithm used by the second root certificate authority, the second digital signature algorithm being different from the first digital signature algorithm.