Cryptography device having improved security against side-channel attacks
US11201725B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 30, 2018 |
| Grant date | Dec 14, 2021 |
| Priority date | — |
| Expiry date | Dec 15, 2038 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2209/16
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
Secure cryptography operations on a white-box cryptography device. Receiving a first message. Receiving a cryptographic key encrypted using a homomorphic encryption scheme. Performing a cryptographic operation, e.g., decryption or digital signature, using the encrypted cryptographic key. Performing a homorphically encrypted tracer calculation that traces the performance of the cryptography operations on the white-box cryptography device thereby allowing verification that all steps of the cryptography operation has been performed without external manipulation. Performing a key-exchange operation. Decrypting the key-exchange output using an alternate cryptographic key stored on the cryptographic device.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.