Self-Signed Certificate Exchange for Email Authentication
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Solution Overview
Problem
Smaller deployments face economic viability issues and cumbersome processes when setting up certificate authorities for email authentication, especially when communicating with a small number of peers, as existing methods require costly third-party certificates or cumbersome self-signing processes.
Innovation Solution
A method for configuring a mail client to generate a public and private key pair, create a self-signed certificate, and send an introduction message to recipients, allowing for the verification and acceptance of self-signed certificates within the mail client, which can act as its own certificate authority.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a third-party certificate authority is used for email authentication, then security and trust are improved, but cost and complexity increase
Solution Approach 1:
The patent enables mail clients to generate and manage their own self-signed certificates without requiring external certificate authorities. The system performs self-service authentication by creating cryptographic key pairs locally and using the self-signed certificates for email encryption and verification, eliminating the need for third-party CA infrastructure.
Solution Approach 2:
The patent introduces an introduction message as an intermediary mechanism that facilitates certificate exchange between peers. This message contains the sender's public key and certificate information, allowing recipients to verify authenticity without requiring a traditional CA hierarchy, thus simplifying the trust model for small deployments.
2Ease of manufacture
If a self-signed certificate is created manually, then cost is reduced, but ease of operation deteriorates
Solution Approach 1:
The mail client automatically generates cryptographic key pairs and creates self-signed certificates through integrated functionality. Users simply need to enable the feature, and the system handles key generation, certificate creation, and configuration automatically, eliminating manual cryptographic operations while maintaining zero cost.
Solution Approach 2:
The system performs certificate generation and configuration in advance as part of the mail client setup process. By pre-configuring the cryptographic infrastructure before email communication begins, the system eliminates the need for users to manually create and manage certificates later, significantly improving ease of operation.
3Reliability
If a certificate is transmitted to a peer for encryption purposes, then security is improved, but ease of operation deteriorates
Solution Approach 1:
The patent combines the certificate transmission with the introduction message that is already part of the email communication flow. The sender's certificate and public key are embedded within the introduction message sent to the recipient, eliminating separate certificate exchange steps and integrating security setup into the natural email interaction.
Solution Approach 2:
The introduction message serves as an intermediary vehicle that carries certificate information between peers. Rather than requiring separate certificate management operations, the message encapsulates all necessary cryptographic data (public key, certificate) that enables immediate encryption and verification capabilities.
Data Source
AI summary
A method and apparatus for sending a self-asserted certificate is described. A mail client of a sender is configured to generate a public and private key pair, to create a self-signed certificate, and to form an introduction message addressed to a recipient to enable use of the self-signed certificate prior to corresponding with the recipient. A mail client of a recipient is configured to display an indicator of a receipt of the introduction message from the sender. The indicator comprises a user interface query to the recipient to verify and accept the sender-signed certificate in response to receiving the introduction message from the sender.