Information storage medium and security method thereof
US6158004A · kind A · utility
54Cited by
4References
3Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 25, 1997 |
| Grant date | Dec 5, 2000 |
| Priority date | — |
| Expiry date | Nov 25, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F21/79
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A security system for an information storage medium is so structured that only file data including secret individual information is encrypted by an encryptor/decryptor circuit. Known file management data is written in a memory device in plain text. This encrypting device prevents any third person from reading the secret information without unnecessary encryption of non-secret data to realize an enhanced security function.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.