Cryptography – Video cryptography – Video electric signal masking
Patent
1998-03-24
2000-09-12
Swann, Tod R.
Cryptography
Video cryptography
Video electric signal masking
380 54, 380210, 713176, H04N 144
Patent
active
061188727
ABSTRACT:
A secret data management apparatus includes an image display unit which displays an image on a display monitor. A position/sequence input unit inputs positions of input image points on the image using an input device and inputs a sequence of the positions using the input device. An encryption unit generates encrypted data of a secret key based on the positions and the sequence from the position/sequence input unit. A secret data storage unit stores the encrypted data of the secret key from the encryption unit in a storage medium. An access allowance unit allows access to the secret key stored in the storage medium when positions of input image points on the image and a sequence of the positions, subsequently specified using the input device at a time of the access, match with the positions and the sequence from the position/sequence input unit. A decryption unit generates plain data of the secret key from the encrypted data stored in the storage medium when the access is allowed by the access allowance unit.
REFERENCES:
patent: 5757915 (1998-05-01), Aucsmith et al.
patent: 5832119 (1998-11-01), Rhoads
patent: 5960086 (1999-09-01), Atalla
Kashima Kazunori
Matsuura Masataka
Darrow Justin T.
Fujitsu Limited
Swann Tod R.
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