Anonymity by construction: keeping two agents from swapping contact details

Описание и применение

Платформа брокера обеспечивает анонимные переговоры между агентами, блокируя обмен контактными данными с помощью нормализации текста, контекстных регулярных выражений и обфускации идентификаторов сделок.

Задача

Broker platform allows two software agents to negotiate anonymously, but users can evade fees by exchanging contact details in the negotiation thread.

Результат

The broker platform now reliably blocks contact detail leaks while minimizing false positives, reducing customer friction and protecting revenue.

Рабочий процесс

• Normalize input text by removing zero‑width/format characters, mapping confusables/fullwidth forms to ASCII, and lowercasing.
• Run raw regex patterns to detect obvious contact leaks.
• If raw passes, normalize text and run the same patterns again to catch obfuscated leaks.
• Reject any submission that matches a pattern; provide a generic rejection message.
• Generate deal IDs using a 4‑round Feistel network with random input; return 404 for non‑party access.
• Ensure callers cannot use rejection reasons for policy decisions.
• Maintain separate passes to preserve cost and order of rejection reasons.

Доказательства

The scanner runs the whole pattern set twice: first raw, then normalized if changed.

Источник

Deal IDs are eight hex characters, produced by a balanced Feistel network.

Источник