Federation Server Token Exchange for Secure Inter-Organization Email
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Solution Overview
Problem
Email security is inadequate due to its lack of encryption and susceptibility to interception and spoofing, especially when messages traverse unsecured networks, and existing solutions for secure email exchange between organizations are cumbersome and do not scale well.
Innovation Solution
An email security system utilizing a federation server that provides tokens for secure communication between email servers of different organizations, allowing encryption and decryption of messages using public and private keys, ensuring secure transmission across unsecured networks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If email messages are transmitted over unsecured networks using SMTP, then email delivery is simple and widely compatible, but message security and confidentiality are compromised due to lack of encryption and susceptibility to interception
Solution Approach 1:
The patent introduces a federation server as an intermediary that acts as a trusted third party between email servers of different organizations. This mediator issues security tokens that enable encrypted communication without requiring direct key exchange between communicating parties, thus maintaining compatibility while improving security.
Solution Approach 2:
The system performs preliminary key exchange and token issuance through the federation server before actual email communication occurs. Organizations pre-register with the federation server, which stores their public keys and issues tokens in advance, eliminating the need for ad-hoc key exchange and enabling immediate secure communication.
2Reliability
If organizations exchange certificates and use SSL or IPSEC for secure email transmission, then message security is improved, but the complexity of key management and certificate exchange increases significantly
Solution Approach 1:
The federation server serves as a centralized intermediary that manages all certificate and key operations. Instead of each organization maintaining complex bilateral key management relationships, the federation server centralizes trust, issuing tokens that simplify the key management process while maintaining strong security through cryptographic protocols.
3Reliability
If each organization securely conveys storage media with keys to every other organization for secure email exchange, then direct secure communication is enabled, but the scalability of the system deteriorates as the number of organizations increases
Solution Approach 1:
The federation server provides universal service to all member organizations, acting as a single point of trust that enables any organization to communicate securely with any other. This multi-functional hub approach replaces the need for numerous bilateral key exchange relationships, achieving both direct secure communication and scalability through a centralized coordination point.
Solution Approach 2:
By introducing the federation server as an intermediary, the system transforms the scaling problem from O(n²) bilateral relationships to O(n) relationships with the central mediator. Each organization only needs to establish trust with the federation server once, enabling efficient scaling as new organizations join the network.
4Reliability
If private email servers transmit email over secure corporate networks using LAN or VPN, then message security within organizations is maintained, but communication between different organizations becomes impossible
Solution Approach 1:
The federation server acts as a trusted intermediary that bridges isolated corporate email systems. By establishing trust relationships with the federation server, organizations can securely extend their internal email security policies to external communications without requiring direct physical or network connections between organizations.
Data Source
AI summary
An email security system is described that allows users within different organizations to securely send email to one another. The email security system provides a federation server on the Internet or other unsecured network accessible by each of the organizations. Each organization provides identity information to the federation server. When a sender in one organization sends a message to a recipient in another organization, the federation server provides the sender's email server with a secure token for encrypting the message to provide secure delivery over the unsecured network.