Browse Prior Art Database

Storage Protect System

IP.com Disclosure Number: IPCOM000090790D
Original Publication Date: 1969-Jul-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 32K

Publishing Venue

IBM

Related People

Handloff, LE: AUTHOR

Abstract

The system provides storage protection and does not add to the physical amount of data stored. The data to be stored is supplied at input 10 to encoder 11. The latter generates error check bits which are supplied with the data to garbler 12. The other input to garbler 12 is a protect key bit pattern from pattern generator 13. The specific pattern generated is selected by an input at terminal 14. Garbler 12 is a set of Exclusive-Or's which garble the resultant data from encoder 11 with the selected protect key pattern and supplies the garbled data to data storage medium 15. To read data from storage 15, the data is supplied to ungarbler 16. The system desiring to read the data provides a key at input 14, causing circuit 13 to generate the selected protect key pattern. Ungarbler 16 is also a set of Exclusive-Or's.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 89% of the total text.

Page 1 of 2

Storage Protect System

The system provides storage protection and does not add to the physical amount of data stored. The data to be stored is supplied at input 10 to encoder 11. The latter generates error check bits which are supplied with the data to garbler 12. The other input to garbler 12 is a protect key bit pattern from pattern generator 13.

The specific pattern generated is selected by an input at terminal
14. Garbler 12 is a set of Exclusive-Or's which garble the resultant data from encoder 11 with the selected protect key pattern and supplies the garbled data to data storage medium 15. To read data from storage 15, the data is supplied to ungarbler 16. The system desiring to read the data provides a key at input 14, causing circuit 13 to generate the selected protect key pattern. Ungarbler 16 is also a set of Exclusive-Or's. If the same pattern is chosen for ungarbling as is chosen for garbling, the garbling is thus cancelled.

The resultant data is supplied to output data decode and check circuitry 17. If the proper pattern is chosen, the data passes circuitry 17, during which errors in the data can be corrected, and is supplied to read data output terminal 18. However, if the wrong pattern is chosen, the data is uncorrectable and an output signal is supplied on error terminal 19. This protection system is equally valid for parallel or serial data transmission and for both linear and cyclic error-correcting codes. A requirement when using error-correcti...