The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 07, 2025
Filed:
Nov. 07, 2023
Tata Consultancy Services Limited, Mumbai, IN;
Arinjita Paul, Thane, IN;
Rajan Mindigal Alasingara Bhattachar, Bangalore, IN;
Imtiyazuddin Shaik, Hyderabad, IN;
Tata Consultancy Services Limited, Mumbai, IN;
Abstract
The present disclosure a method for a lattice-based homomorphic proxy re-encryption scheme. Conventional methods are attribute based and the attribute-based encryption schemes employ very expensive operations and generate long ciphertexts and secret keys (whose sizes also increase linearly with the size of the access policy), which makes them hard to implement in real-life applications. The present disclosure provides a unidirectional, single-hop HPRE scheme from the Learning With Errors (LWE) assumption which is Chosen Plaintext Attack (CPA) secure. Further, the present disclosure is based on the widely accepted BGV algorithm that supports both levelled FHE operations as well as arbitrary number of ciphertexts with unique and secure re-encryption key generation. Further, the present disclosure provides batch evaluation of ciphertexts, in order to enable re-encryption and evaluation of multiple ciphertexts.