发明名称 |
Anti-tampering signature method for rewritable media, anti-tampering signature apparatus for executing the method, anti-tampering signature system provided with the apparatus, and computer-readable recording medium storing anti-tampering signature program for achieving the method |
摘要 |
An anti-tampering signature apparatus is provided with an extraction portion 33 for extracting a characteristic quantity that represents a characteristic of image data according to an instruction from a certifier who has certified display data, an encryption/decryption portion 35 that generates encrypted data by encrypting the characteristic quantity using an encryption key paired with an identifier and decrypts the encrypted data into the characteristic quantity, a media writing portion 34 that appends the identifier and the encrypted data to a rewritable medium, and a controller 37 that judges whether or not the decrypted characteristic quantity and the characteristic quantity extracted from image data generated by reading the display data match.
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申请公布号 |
US7533267(B2) |
申请公布日期 |
2009.05.12 |
申请号 |
US20050520717 |
申请日期 |
2005.01.06 |
申请人 |
SHARP KABUSHIKI KAISHA |
发明人 |
YOSHIMURA HIDEYOSHI |
分类号 |
G09C1/00;H04L9/00;G06F7/04;H04L9/32;H04N1/32 |
主分类号 |
G09C1/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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