Cryptographic management of lifecycle states
US11582033B2 · kind B2 · utility
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4References
20Claims
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Key dates
| Filing date | Dec 11, 2020 |
| Grant date | Feb 14, 2023 |
| Priority date | — |
| Expiry date | Dec 23, 2040 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L9/0891
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A secret key value that is inaccessible to software is scrambled according to registers consisting of one-time programmable (OTP) bits. A first OTP register is used to change the scrambling of the secret key value whenever a lifecycle event occurs. A second OTP register is used to undo the change in the scrambling of the secret key. A third OTP register is used to affect a permanent change to the scrambling of the secret key. The scrambled values of the secret key (whether changed or unchanged) are used as seeds to produce keys for cryptographic operations by a device.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.