Iceberg Remote Signing for Regulated Datasets

This article details Iceberg remote signing, a security model for regulated datasets (PII, financial, healthcare) that provides the strongest access delegation in the Iceberg ecosystem. Unlike traditional static keys or credential vending, remote signing issues per-file, one-time-use pre-signed URLs for specific read/write operations with short expiration windows. The article covers how it works via the Iceberg REST catalog's S3SignRequest API, compares it to credential vending, discusses audit trail capabilities, performance considerations, and server-side scan planning. It emphasizes the principle of least privilege at the finest granularity, ensuring even authenticated engines must be authorized for each file access, enabling enforcement of row filters and column masks.