Electrical computers and digital processing systems: support – Multiple computer communication using cryptography – Particular communication authentication technique
Reexamination Certificate
2006-12-05
2006-12-05
Barron, Jr., Gilberto (Department: 2132)
Electrical computers and digital processing systems: support
Multiple computer communication using cryptography
Particular communication authentication technique
C382S100000
Reexamination Certificate
active
07146502
ABSTRACT:
Whether or not information has been tampered with can be detected while authentication information is set to be inseparable from digital information, and original digital data can be restored as long as it is free from tampering. For this purpose, when authentication information is embedded into digital information input by an image input unit (201), a Hash value calculation unit (202) generates authentication information based on that digital information, an encryption unit (203) encrypts the authentication information using an encryption key, and a digital watermarking unit (204) embeds the encrypted information in the digital information as a digital watermark.
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Partial translation and Abstract of JP-A-2000-152148.
Barron Jr. Gilberto
Canon Kabushiki Kaisha
Dinh Minh
Fitzpatrick ,Cella, Harper & Scinto
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