Cryptography – Key management – Having particular key generator
Patent
1997-04-02
1999-12-14
Hayes, Gail O.
Cryptography
Key management
Having particular key generator
380 4, 380 23, 380 25, 380 21, H04L 900, H04K 100
Patent
active
06002772&
ABSTRACT:
To prevent piracy or leakage of data content, a cryptography technique and electronic watermark technique are combined together and used. In a data content supplied to a user, a user data is entered as electronic watermark by a data management center, and the data content with an electronic watermark entered in it is encrypted using a crypt key and is supplied. The encrypted data content is decrypted using a crypt key distributed from the data management center and is used. In case it is to be stored, it is encrypted using another crypt key. In case the data content is copied and transferred to other user, a user data of the other user is entered as electronic watermark, and a scenario to enter the user data of the other user as electronic watermark is registered at the data management center, and the data content with electronic watermark entered in it is encrypted using another crypt key and is supplied. When the validity of the other user is confirmed by the scenario, another crypt key is distributed to the other user. The encrypted data content is decrypted using another crypt key and is used. When it is to be stored, it is encrypted using still another key. In case the data content has been copied and transferred illegitimately, it is possible by verifying the electronic watermark to identify the user who has copied and transferred the data content illegitimately.
REFERENCES:
patent: 5455863 (1995-10-01), Brown et al.
patent: 5455941 (1995-10-01), Okuno et al.
patent: 5465299 (1995-11-01), Matsumoto et al.
patent: 5646999 (1998-07-01), Saito
patent: 5848158 (1998-12-01), Saito
Hayes Gail O.
Mitsubishi Corporation
Sayadian Hrayr A.
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