Research Tools & Code·arXiv cs.CL·2d ago

Selective Token-Level Cryptographic Redaction for Privacy-Preserving Clinical Deployment of Large Language Models

Illustration accompanying: Selective Token-Level Cryptographic Redaction for Privacy-Preserving Clinical Deployment of Large Language Models

Researchers introduce HERALD, a token-level encryption framework that selectively redacts sensitive clinical data before LLM processing, addressing a critical deployment bottleneck in healthcare AI. Rather than encrypting entire datasets (which creates computational and alignment overhead), the system encrypts only sensitive tokens, enabling privacy-compliant remote inference without sacrificing model performance. This work directly tackles the infrastructure gap between LLM capability and regulatory feasibility in regulated domains, making on-premise or hybrid deployments more practical for hospitals and health systems evaluating production LLM pipelines.

Modelwire context

Analyst take

The paper's real contribution isn't encryption itself but the granularity: encrypting at the token level rather than the record level means clinical teams can route only the sensitive fragments away from third-party inference endpoints, which is a meaningful architectural concession to HIPAA-adjacent compliance requirements without abandoning frontier model access entirely.

This sits directly alongside a cluster of recent clinical NLP work on Modelwire. The self-harm surveillance paper from June 1 demonstrated that LLMs can generalize across hospital systems for high-stakes screening, but that work implicitly assumed data could reach the model. HERALD addresses the prior condition that paper glosses over: how does sensitive triage text actually get to the model without creating a compliance liability? Similarly, the Llama-3 clinical provenance work from June 1 showed fine-tuned models solving structured extraction in regulated environments, but fine-tuning requires training data pipelines that carry the same exposure risk HERALD is designed to contain. The infrastructure question is catching up to the capability question.

Watch whether any of the major EHR vendors (Epic, Oracle Health) reference token-level redaction architectures in their LLM partnership disclosures over the next two quarters. Adoption at that layer would confirm this approach is becoming a procurement requirement rather than an academic proposal.

Coverage we drew on

Transferable Self-Harm Surveillance from Emergency Department Triage Notes Using an Evidence-Augmented Machine Learning Approach · arXiv cs.CL

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MentionsHERALD · LLM · Healthcare Encryption & Redaction via Adaptive Linguistic Decomposition

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