MUMBAI, India, Nov. 2 -- Intellectual Property India has published a patent application (202641126818 A) filed by Vellore Institute Of Technology on October 24, 2026, for System And Method For Cryptographic Multi-Tenant Subspace Isolation And Revocable Vector Retrieval.
Inventors include Konatham Sumalatha; Khose Yash Ninad; Thaker Nitya Ajit; and Smit Bhavesh Trivedi.
The application for the patent was published on October 30, 2026, under issue no. 44/2026.
Abstract: ABSTRACT SYSTEM AND METHOD FOR CRYPTOGRAPHIC MULTI-TENANT SUBSPACE ISOLATION AND REVOCABLE VECTOR RETRIEVAL A system (100) for encrypted vector retrieval includes a key distribution center (102) holding a master secret (120) and an orthonormal matrix (202) partitioned into mutually orthogonal tenant column blocks, a data owner client device (104), a revocation proxy (106), and a storage server (108) storing ciphertexts (118) of document vectors lifted by the tenant column block of the corresponding tenant and encrypted under inner-product functional encryption. The key distribution center (102) authenticates a tenant identity, lifts a query vector with the tenant column block of the authenticated tenant, and derives a functional decryption subkey associated with an issuance epoch. The revocation proxy (106) forwards the subkey unmodified when a user identifier is absent from a revoked registry (122) and the issuance epoch matches a current tenant epoch in a tenant epoch table (124), and otherwise adds random noise exceeding a maximum valid inner-product value. (Fig. 1)
Disclaimer: Curated by HT Syndication.
