Bi-Directional CA Certificate Exchange for Mutual Inline Authentication

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Solution Overview

Problem

Existing data backup systems lack a method for efficiently verifying the identity of both the server and client in a secure, inline process, particularly in large-scale environments with thousands of clients, which is crucial for preventing man-in-the-middle attacks and ensuring data integrity.

Innovation Solution

Implementing a bi-directional exchange of certificate authority (CA) certificates, where both the server and client securely send encrypted CA certificates as part of the authentication sequence, using a pre-shared key (PSK) to establish a mutually authenticated encrypted connection, enabling both parties to verify each other's identity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a server securely sends a CA certificate to the client inline as part of the authentication sequence, then the server identity can be verified by the client, but no verification of the client to the server is provided

Engineering Contradiction:

Improveserver identity verificationVSAvoidauthentication process completeness

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The patent applies inversion by having the client send its CA certificate to the server, reversing the traditional unidirectional certificate delivery. This enables bidirectional verification where both parties can authenticate each other, transforming a one-way trust model into a mutual authentication system that enhances security without complicating the inline authentication flow

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The CA certificate exchange mechanism serves multiple functions: it enables server verification by the client, client verification by the server, and establishes mutual trust. This multi-functional approach resolves the contradiction by making the authentication sequence simultaneously provide complete verification in both directions while maintaining operational simplicity

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Reliability

If certificate-based authentication is required for security and compliance, then data integrity is ensured, but managing and deploying certificates in a large-scale environment with thousands of clients becomes very challenging

Engineering Contradiction:

Improvedata integrityVSAvoidcertificate management complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent extracts the certificate management burden from individual clients by implementing server-side CA certificate distribution. The server holds and manages the CA certificates, sending them inline to clients during authentication, thereby centralizing management complexity at the server while simplifying client deployment in large-scale environments

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The CA certificate acts as an intermediary that enables trust verification without requiring direct certificate management on each client device. By delivering the CA certificate through the authentication sequence, the system mediates the trust relationship, allowing clients to verify server identity and enabling scalable deployment without individual certificate maintenance

Inventive Principle:

Principle #24Intermediary (Mediator)

3Ease of operation

If traditional authentication methods are used, then setup is simpler, but they lack the security required for preventing man-in-the-middle attacks in large-scale deployments

Engineering Contradiction:

Improveauthentication setupVSAvoidman-in-the-middle attack vulnerability

Core Design Contradiction:

Ease of operationVSObject-affected harmful factors

Solution Approach 1:

The patent applies preliminary action by pre-configuring the server with CA certificates and establishing the bidirectional verification capability before actual data transfers occur. The authentication sequence is enhanced in advance to include mutual certificate verification, preventing man-in-the-middle attacks from the outset while maintaining seamless operation during data transfers

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The bidirectional CA certificate verification serves as preliminary anti-action against man-in-the-middle attacks. By establishing mutual authentication before any data exchange, the system proactively neutralizes the threat of interception and impersonation, ensuring security without adding operational complexity to the authentication flow

Inventive Principle:

Principle #9Preliminary anti-action

Data Source

PatentUS12549387B2Secure method of bi-directional inline exchange of cryptographic certificates for data transfers

Publication Date: 2026.02.10 DELL PROD LP

AI summary

Embodiments for securely exchanging Certificate Authority (CA) certificates inline and bi-directionally to make it easier for client-server transmissions to use certificate-based authentication. The client certificate is transferred securely through encryption with a pre-shared key based on certain parameters, and the server certificate is transferred securely through encryption with a pre-shared key based on the parameters. The process reduces the burden from applications to maintain and save the CA certificate. It also reduces the burden from server to maintain and save the CA certificate of the client so that server can select it to be used during authentication. This helps enable large scale deployments where the server can maintain the CA certificate and send it to client.