Email Gateway Anomaly Detection via Hidden 2FA Verification
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Solution Overview
Problem
Current technologies are inadequate in detecting forged e-mail messages, particularly those sent from legitimate user accounts, as they cannot differentiate between genuine and forged messages when password theft occurs, and two-factor authentication can be burdensome and alert attackers to additional security measures.
Innovation Solution
A system that uses a two-factor authentication mechanism at an e-mail gateway, where messages from users with enabled 2FA are checked for anomalies, and if suspicious, a hidden account is alerted for verification, allowing users to confirm whether the message is legitimate or forged, thereby preventing delivery of fraudulent messages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If two-factor authentication is implemented at e-mail gateway, then detection precision of forged messages is improved, but device complexity increases
Solution Approach 1:
An e-mail gateway is introduced as an intermediary component between the sender and recipient. The gateway intercepts outgoing e-mails, analyzes them for anomalies using multiple detection technologies (SPF, DKIM, DMARC, machine learning), and either blocks or relays the message accordingly. This mediator approach enables sophisticated detection without requiring changes to sender or recipient systems.
Solution Approach 2:
The detection system is segmented into multiple independent detection technologies working in parallel: SPF verification, DKIM validation, DMARC policy checking, and machine learning anomaly detection. Each technology handles a specific aspect of forgery detection, and their results are combined to make the final delivery decision. This segmentation allows complex detection without overwhelming a single component.
2Reliability
If two-factor authentication is required for all users, then reliability against password theft is improved, but ease of operation deteriorates
Solution Approach 1:
Instead of requiring 2FA for all users unconditionally, the system applies partial action by using multiple detection technologies only when anomalies are detected in the e-mail content, metadata, or sending patterns. Normal e-mails pass through with minimal intervention, while suspicious messages trigger additional verification steps such as user notification or blocking.
Solution Approach 2:
The security level applied to each e-mail is dynamic rather than static. The system continuously adapts the detection intensity based on real-time analysis of message characteristics, sender behavior patterns, and anomaly scores. Low-risk messages receive minimal scrutiny while high-risk messages trigger comprehensive verification, optimizing both security and user experience.
3Reliability
If 2FA usage is made known to attackers, then security awareness is improved, but object-generated harmful factors increase
Solution Approach 1:
The system converts the potential harm of attackers knowing security measures are in place by using machine learning to detect sophisticated forgery techniques that attackers develop in response. The increased security awareness of attackers leads to more advanced attack methods, which in turn provide better training data and improve the machine learning detection models, creating a beneficial feedback loop.
Data Source
AI summary
An e-mail message is sent from a public e-mail address via the e-mail account of a user and delivered to an e-mail gateway. The message is destined for the e-mail account of a recipient. The gateway determines that the public e-mail address is on a list of users desiring two-factor authentication. The gateway determines that the message contains an anomaly indicating fraud or possible forgery. The gateway sends a two-factor authentication message to a hidden e-mail account of the user. The user reviews the message and responds with a confirmation message either confirming that the message is legitimate or indicating that it is a forgery. If the message is legitimate the gateway allows the message to be delivered to the recipient; if not, the message remains in quarantine and is not delivered. The gateway exists at the user's corporation, the recipient's corporation or is hosted at a third-party cloud service.