Data processing with a key
US7529369B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 20, 2001 |
| Grant date | May 5, 2009 |
| Priority date | — |
| Expiry date | Nov 23, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L9/14
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
In a data processing device, a first key is produced based on a secret key so that the latter is never used in a clear form. In a preliminary step, the secret key and a random number are applied to a function producing a first key. The first key and the random number are pre-stored in the device. For each data processing, the first key and another random number are applied to another function to produce a second key, and the second key and the stored number are applied as inverse of the function to produce a third key used for processing the data. The device can be a smart card and the data the confidential code presented to the card.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.