Method and apparatus for preserving error correction capabilitie

Details Method and apparatus for preserving error correction capabilitie Method and apparatus for preserving error correction capabilitie

1997-07-17

2000-04-04

Hayes, Gail O.

Cryptography

Communication system using cryptography

Pseudo-random sequence scrambling

714800, H04L 900, G06F 1100, H03M 1300

Patent

active

060470690

ABSTRACT:
A data encryption/decryption system encrypts data and its associated redundancy bytes while retaining the error correction capabilities of the original data. The error correction function can then be removed, for example, from a storage drive and performed by, e.g. a host processor or a other entity. The storage drive reads the raw data, including error correction codes, from the media and encrypts the data by exclusive OR-ing each error correction code (ECC) block with a new ECC block which was generated using random data and the same ECC scheme. Error correction of the new data block can be performed in the host processor or other entity without exposing the original data. The error correction is valid for any errors that occurred in the original raw data because the ECC redundancy bytes of the random data block were created using the same ECC generator as was used with the original data. A trusted entity decrypts the error corrected data block by creating a random data block that is the equivalent of the random data block created in the storage drive. The error corrected data block is exclusive OR-ed with the random data block and is returned its original decrypted and error corrected state.

REFERENCES:
patent: 5285497 (1994-02-01), Thatcher, Jr.
patent: 5602595 (1997-02-01), Citta et al.
patent: 5721747 (1998-02-01), Herrera Van Der Nood et al.
patent: 5802107 (1998-09-01), Willing

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