Arrangement for encryption/decryption of data and data carrier incorporating same
US6826691B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 15, 1999 |
| Grant date | Nov 30, 2004 |
| Priority date | — |
| Expiry date | Nov 15, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2209/12
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An arrangement (6) for encrypting/decrypting data includes a random access memory (12) for holding the data and a processor (10) for processing the data. The processor includes a memory map including a first portion (12.0) mapped onto the random access memory and a second portion (12.1). The processor further includes control means (18, 34, 26) coupled to receive all instruction to write data to an address in the second portion of the memory map and in response thereto to write the data in a predetermined permuted form to an associated address in the random access memory. The data read from said associated address in the random access memory is an encrypted/decrypted version of the data written to said address in the second portion of the memory map.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.