Key insulation method and device
US9215073B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 2, 2014 |
| Grant date | Dec 15, 2015 |
| Priority date | — |
| Expiry date | Apr 2, 2034 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L9/088
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
Embodiments of the present invention provide a key insulation method and device. The key insulation method includes: randomly selecting a first parameter s from Z*q, acquiring a helper initial key from a helper, and generating an initial user private key according to the first parameter s, a preset first cryptographic hash function H1, and the helper initial key; and acquiring a helper updated key for a time segment i from the helper, and updating a user private key for a time segment j according to the helper updated key for the time segment i to obtain a user private key for the time segment i. According to the key insulation method and device provided by the embodiments, in a process of generating an initial key and a process of updating a key, lifecycle is not involved, which improves flexibility of a key system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.