Signing method and apparatus using the same

Details Signing method and apparatus using the same Signing method and apparatus using the same

1996-12-30

2000-06-06

Hayes, Gail O.

Cryptography

Video cryptography

Video electric signal modification

380229, 380232, 380278, H04N 7167

Patent

active

060728744

ABSTRACT:
The present invention provides a signing apparatus used for signing by a user on usage information of a source provided in a format made available by the use of key information. The apparatus includes a unit for generating the usage information which is to be signed, a unit for performing a first computation by utilizing the key information which has been encrypted and the usage information, a unit for performing a second computation by utilizing a user's private key and a result of the first computation. The apparatus further includes a unit for performing a third computation by utilizing a result of the second computation, and thereby generating the key information which has been decrypted and a result of the computation performed on the usage information by utilizing the user's private key. The apparatus further includes a unit for making the source available by utilizing the decrypted key information.

REFERENCES:
patent: 5050213 (1991-09-01), Shear
patent: 5457746 (1995-10-01), Dolphin
patent: 5537473 (1996-07-01), Saward
patent: 5557679 (1996-09-01), Julin et al.
patent: 5727065 (1998-03-01), Dillon
patent: 5742677 (1998-04-01), Pinder et al.
patent: 5825876 (1998-10-01), Peterson, Jr.
patent: 5845281 (1998-12-01), Benson et al.

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