Client-Rooted PKI for Scoped Cloud Traffic Decryption
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional cloud-based inspection methods fail to address the security vulnerabilities and scalability issues in decrypting and inspecting encrypted traffic, particularly due to the centralized certificate management and the lack of visibility in the encryption of the existing technologies.
Innovation Solution
Implementing a client-rooted Public Key Infrastructure (PKI) where each client device operates as its own localized Certificate Authority (CA), generating and managing certificates, thereby limiting the scope of trust and enhancing the scalability and security of cloud-based inspection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If centralized certificate generation and management is used by cloud proxies, then certificate trust can be established across multiple client devices, but security vulnerabilities increase due to compromised proxy nodes impacting numerous clients simultaneously
Solution Approach 1:
The patent segments the centralized certificate authority into distributed client-specific intermediate CAs. Each client device receives its own intermediate CA certificate from the cloud proxy, creating isolated trust segments. This segmentation ensures that compromise of one client's intermediate CA does not affect other clients, resolving the security vulnerability while maintaining certificate trust functionality.
Solution Approach 2:
The patent implements local quality by making each client device the root of its own trust hierarchy through client-specific intermediate CA certificates. Each client's trust scope is localized to that specific client device, creating different trust qualities for different clients. This localized trust model maintains versatility while reducing security risks associated with centralized certificate management.
2Device complexity
If centralized certificate generation and signing is performed by cloud proxies, then certificate management is simplified, but computational burden increases latency and limits scalability
Solution Approach 1:
The patent applies preliminary action by having the cloud proxy pre-generate intermediate CA certificate signing requests (CSRs) for each client device before actual certificate issuance. The proxy prepares the CSR structure and client identity information in advance, then sends it to the client device for local signing. This preliminary preparation reduces the computational burden on the proxy during actual certificate issuance, lowering latency and improving scalability while maintaining simplified management.
Solution Approach 2:
The patent introduces an intermediary approach where the cloud proxy acts as a mediator that generates CSRs but delegates the actual signing operation to the client device's local key pair. The proxy intermediates between the need for centralized certificate management and the capability for distributed signing, reducing its computational burden while maintaining management control. This intermediary role improves scalability by distributing the computationally intensive signing operation.
3Adaptability or versatility
If cloud proxies act as man-in-the-middle nodes generating certificates trusted by client devices, then encrypted traffic inspection capability is enabled, but security blast radius increases when proxy nodes are compromised
Solution Approach 1:
The patent segments the certificate trust scope by issuing unique intermediate CA certificates to each client device instead of using a single proxy-generated certificate for all clients. This segmentation creates isolated trust boundaries, ensuring that if a proxy node is compromised, the security impact is confined to individual client sessions rather than affecting all clients simultaneously. The encrypted traffic inspection capability is maintained through per-client certificate validation.
Solution Approach 2:
The patent implements local quality by making each client device the root of its own trust hierarchy through client-specific intermediate CA certificates. Each client's trust scope is localized to that specific client device, creating different trust qualities for different clients. This localized trust model maintains encrypted traffic inspection capability while reducing security risks associated with centralized certificate management.
Data Source
AI summary
Techniques for implementing a client-rooted decryption Public Key Infrastructure (PKI) to securely inspect encrypted traffic in cloud-based proxy environments are disclosed. A proxy node generates an intermediate Certificate Authority (CA) certificate signing request (CSR) and sends it to a client device equipped with a locally-managed root CA. The client device cross-signs the CSR, creating a client-specific intermediate CA certificate, which it returns to the proxy node. This client-specific intermediate CA certificate is scoped uniquely to the individual client device, significantly reducing the potential blast radius in case of CA key compromise. The proxy node uses the client-specific CA certificate to dynamically generate short-lived, scoped decryption certificates for inspecting encrypted traffic. This architecture provides client-level control of trust boundaries, enhanced traceability, reduced complexity, and improved scalability of encrypted traffic inspection, minimizing the operational risks associated with conventional centralized certificate management.