Information storage medium and security method thereof
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
Dec 5, 2000
Grant Date -
N/A
app pub date -
Nov 25, 1997
filing date -
Jun 10, 1997
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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