Secure Email Relay Server Domain Segmentation
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Solution Overview
Problem
Existing e-mail messaging systems fail to maintain separate execution domains for secure and external communication, leading to potential security breaches by exposing domain structures and certificates, which is not compliant with security standards like Director of Central Intelligence Directive 6/3.
Innovation Solution
A secure e-mail messaging system with an e-mail relay server that separates secure and external domains by using alias addresses and certificates, decrypting and encrypting messages, and verifying content to prevent domain structure exposure and maintain security levels, employing an e-mail handler process to replace alias with actual addresses and encrypt messages accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If certificates are used to enhance security of e-mail communications, then security is improved, but sensitive information about domain structure is exposed
Solution Approach 1:
The system segments the domain structure information by creating separate execution domains (secure domain and external domain). Certificates are issued within specific domains and cannot be used outside them, preventing domain structure exposure while maintaining security. The relay server acts as an intermediary that segments the communication path between secure and external domains.
Solution Approach 2:
The relay server functions as an intermediary between secure and external domains. It receives encrypted messages from external clients, decrypts them using certificates from the secure domain, and forwards them to secure clients. This intermediary approach allows secure communication without exposing domain structure information directly between external and secure domains.
2Adaptability or versatility
If domain structures are exposed through certificates, then communication between domains is enabled, but security breaches occur
Solution Approach 1:
The system divides the network into separate execution domains with distinct certificate authorities. Each domain maintains its own certificate hierarchy, allowing communication between domains while preventing security breaches. The segmentation ensures that certificates from one domain cannot be misused in another domain.
Solution Approach 2:
The relay server mediates communication between domains by acting as a trusted intermediary. It validates certificates from the secure domain when receiving messages from external domains, enabling cross-domain communication while preventing unauthorized access and security breaches through its intermediary position.
3Ease of operation
If certificates from secure domain are accessible to external clients, then e-mail transmission is simplified, but security compliance is violated
Solution Approach 1:
The relay server serves as an intermediary that handles certificate validation and message routing between secure and external domains. External clients communicate with the relay server using their own certificates, while the relay server manages secure domain certificates internally, simplifying external client operations while maintaining security compliance.
Solution Approach 2:
The system extracts sensitive certificate information from the secure domain and places it within the relay server's secure execution environment. External clients do not need direct access to secure domain certificates; instead, they interact with the relay server which handles certificate management, easing operation while preserving security.
Data Source
AI summary
According to one embodiment, a secure e-mail messaging system includes an e-mail relay server coupled to a secure client configured on a secure domain and an external client configured on an external domain. The e-mail relay server has a memory for storage of an actual address of the secure client, a first certificate associated with the actual address, an alias address associated with the actual address, and a second certificate associated with the alias address. The e-mail relay server receives an e-mail message that includes the alias address from the external client and decrypts the e-mail message according to the second certificate. The e-mail messaging server then replaces the alias address with the actual address to form a modified e-mail message, encrypts the modified e-mail message according to the first certificate, and transmits the modified e-mail message to the secure client.