Apparatus for limiting reproducible number of magnetic recording

Details Apparatus for limiting reproducible number of magnetic recording Apparatus for limiting reproducible number of magnetic recording

1995-12-01

1998-08-18

Barron, Jr., Gilberto

Cryptography

Cryptanalysis

380 21, 380 22, G11B 15087

Patent

active

057968268

ABSTRACT:
A reproducible number limiting apparatus for a magnetic recording medium using a reproducible number limiting algorithm is disclosed including: scrambling means for scrambling an input bit stream using a scrambling key; encryption means for encrypting the scrambling key used in the scrambling means' scrambling and additional information, and outputting a ciphertext; a key storage for storing an encryption key required in encryption; recording/reproducing means for recording or reproducing the output of the scrambling means and encryption means; decryption means for updating the additional information for every playback from the ciphertext using an encryption key, and destroying the scrambling key when the additional information satisfies a specific condition; and descrambling means for descrambling a reproduced bit stream using the scrambling key from the decryption means.

REFERENCES:
patent: 5440631 (1995-08-01), Akiyama et al.

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