Method of and apparatus for retaining and verifying of data on r

Details Method of and apparatus for retaining and verifying of data on r Method of and apparatus for retaining and verifying of data on r

1998-01-27

2000-11-07

Swann, Tod R.

Cryptography

Video cryptography

Video electric signal modification

G06F 1216

Patent

active

061447455

ABSTRACT:
For warranting a validity of data recorded on a medium such as a rewritable magneto-optic disk etc, when registering a plurality of documents (n, n+1 . . . ) on the same recording medium, an n-th authenticator obtained by executing an encrypting process of data of the n-th document is recorded together with the n-th document data, and, when registering data of the (n+1)th document, an (n+1)-th authenticator is generated by executing the encrypting process of the n-th authenticator and the (n+1)-th document data as the (n+1)th authenticator.

REFERENCES:
patent: 5646993 (1997-07-01), Aizawa
patent: 5657299 (1997-08-01), Nakajima et al.
patent: 5857021 (1999-01-01), Kataoka et al.
patent: 5881038 (1999-03-01), Oshima et al.

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