English

Introducing the Generative Application Firewall (GAF)

Cryptography and Security 2026-01-26 v2 Artificial Intelligence
Authors: Joan Vendrell Farreny , Martí Jordà Roca , Miquel Cornudella Gaya , Rodrigo Fernández Baón , Víctor García Martínez , Eduard Camacho Sucarrats , Alessandro Pignati
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Abstract

This paper introduces the Generative Application Firewall (GAF), a new architectural layer for securing LLM applications. Existing defenses -- prompt filters, guardrails, and data-masking -- remain fragmented; GAF unifies them into a single enforcement point, much like a WAF coordinates defenses for web traffic, while also covering autonomous agents and their tool interactions.

Cite

@article{arxiv.2601.15824,
  title  = {Introducing the Generative Application Firewall (GAF)},
  author = {Joan Vendrell Farreny and Martí Jordà Roca and Miquel Cornudella Gaya and Rodrigo Fernández Baón and Víctor García Martínez and Eduard Camacho Sucarrats and Alessandro Pignati},
  journal= {arXiv preprint arXiv:2601.15824},
  year   = {2026}
}

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