Personal Certificate Authority for Multi-Device Sync
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Solution Overview
Problem
Existing authentication systems based on public key infrastructure (PKI) face challenges in synchronizing digital certificates across multiple user devices and lack human-readable memorability, with password synchronization tools being vulnerable.
Innovation Solution
A system where a root user device acts as a personal certificate authority, generating and managing device-specific cryptographic key pairs and digital certificates for non-root user devices through a certificate brokerage service, ensuring secure authentication and synchronization across devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If digital certificates are used for authentication, then security is improved, but synchronization across multiple devices becomes difficult
Solution Approach 1:
A cloud-based certificate management service acts as an intermediary between multiple user devices and the certificate authority. This service automatically synchronizes digital certificates across devices by receiving certificates from the CA and distributing them to authorized devices, eliminating the manual synchronization problem while maintaining security.
Solution Approach 2:
The system separates the certificate management function into distinct components: a cloud-based management service handles synchronization and distribution, while local devices store and use certificates. This segmentation allows the complex synchronization task to be handled by the cloud service rather than requiring complex local implementations on each device.
2Ease of operation
If passwords are synchronized, then ease of access is improved, but security vulnerabilities increase
Solution Approach 1:
The system replaces the mechanical approach of synchronizing passwords with cryptographic digital certificates. Instead of distributing sensitive password data that can be intercepted or stolen, the system uses public key infrastructure where only public keys and certificate signatures are transmitted, providing the same authentication functionality with enhanced security.
Solution Approach 2:
The authentication mechanism changes from password-based (symmetric authentication) to certificate-based (asymmetric authentication). This parameter change transforms the security model by using cryptographic pairs where the private key never leaves the user's device, fundamentally improving security while maintaining convenience through automated certificate management.
3Reliability
If digital certificates are implemented, then authentication security is improved, but human memorability is lost
Solution Approach 1:
The cloud-based certificate management service automates the entire certificate lifecycle including generation, storage, synchronization, and renewal. Users simply need to register their devices and the service handles all cryptographic operations automatically, making the complex certificate management transparent to users while maintaining high security.
Solution Approach 2:
The system performs preliminary actions by automatically generating and storing cryptographic key pairs and certificates before they are needed for authentication. Certificates are pre-synchronized to devices during registration, and the system proactively manages renewals and revocations, eliminating the need for users to manually handle cryptographic materials.
Data Source
AI summary
A root user device associated with a user receives a request from a non-root user device associated with the user to issue a digital certificate to the non-root user device. The root user device utilizes a shared secret to determine whether the request is valid. If the request is determined to be valid, the root user device uses a public cryptographic key of a cryptographic key pair generated by the non-root user device to generate the digital certificate. The root user device digitally signs the digital certificate by using its private cryptographic key of a cryptographic key pair generated by the root user device. The root user device issues the digitally signed digital certificate to the non-root user device for use in authentication of the non-root user device.