MUMBAI, India, Aug. 17 -- Intellectual Property India has published a patent application (202641096629 A) filed by Vellore Institute Of Technology on August 10, 2026, for System And Method For Cold-State Phase-Change Gating Of Retrieval-Augmented Generation Corpora Via Hardware-Attested Thermal Measurement And Per-Query Binding.
Inventors include Manikandan K; and Abhijai S.
The application for the patent was published on August 14, 2026, under issue no. 33/2026.
Abstract: The present invention relates to a secure access control system for retrieval-augmented generation (RAG) environments using a thermally conditioned authentication token. The system comprises a phase-change reservoir (101), a PT100 RTD (102), an optical phase witness (103), a controller (104), NFC Type-4B card emulation (105), and a secure cryptographic element comprising an ATECC608B (106). The authentication token generates a cryptographically signed Cold-State Proof Object (CSPO) based on a verified solid-state condition of the phase-change reservoir (101). A RAG gateway (108) validates the CSPO and, upon successful authentication, enables a hardware security module (110) to derive a context-specific cryptographic wrapping key for decrypting only authorized encrypted per-context shards (109). Authentication is performed on a per-query basis, with automatic expiration as the phase-change reservoir (101) warms beyond a predetermined threshold. Failed authentication attempts are denied and immutably recorded in an audit ledger (111), thereby providing hardware-anchored, relay-resistant, and fail-secure protection for context-specific enterprise knowledge repositories.
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