Cryptography – Cryptanalysis
Patent
1992-09-09
1995-04-18
Gregory, Bernarr E.
Cryptography
Cryptanalysis
380 4, 380 9, 380 23, 380 24, 380 49, 380 50, 380 54, 235379, 235380, 371 371, 371 374, 371 375, H04L 900, H03M 13100, G06F 1110
Patent
active
054085314
ABSTRACT:
After an error correcting code is added to a data to be recorded at recording, a data converting process, such as data rotation or data interchange is executed so as to exceed an error correcting ability when the data is reproduced at reproducing, and then the data is recorded on a recording medium. At the time of data reproducing, an inverse data converting process of the data converting process at the time of data recording is executed and then, errors are corrected to restore the data. In a case when the data converting process at reproducing does not coincide with the inverse data converting process at recording, errors exceeding the error correcting ability are generated in most of the cases. Thus, the information recording/reproducing apparatus of this invention has a function for protecting the data.
REFERENCES:
patent: 4785361 (1988-11-01), Brotby
patent: 4788685 (1988-11-01), Sako et al.
patent: 4809274 (1989-02-01), Walker et al.
patent: 4852101 (1989-07-01), Kobayashi et al.
patent: 4903296 (1990-02-01), Chandra et al.
Gregory Bernarr E.
Olympus Optical Co,. Ltd.
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