The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 30, 1994
Filed:
Aug. 05, 1992
Applicant:
Inventors:
Assignee:
Value Technology Inc., Hsin-Chu, TW;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04L / ;
U.S. Cl.
CPC ...
380-4 ; 380-9 ; 380 23 ; 380 25 ; 380 49 ; 380 50 ; 34082531 ; 34082534 ;
Abstract
A hard disk data security device comprises a control circuit which once detecting an I/O address of data register for hard disk present on the address bus enables a data enciphering/deciphering circuit which receives the data to be stored on the hard disk from the computer inside which the hard disk is installed and converts the data from a regular form into an encrypted form or receives the encrypted data from the hard disk and decrypts and outputs the data to the computer. A plurality of switches may be provided for a user to select an arbitrary encrypting pattern of the data byte.