发明名称 |
Method for making invertible digital watermarks with digital watermark techniques and cryptographic methods subdivides a digital document into sets with a watermark in one set dependent on cryptographic functions in another set. |
摘要 |
A digital picture (1) to be made secure is displayed. Using a code selects data sets A (2) and B (3) in a pseudo-random manner. Data set A is subjected to the creation (4) of hash values to form an HA hash value for it. Data set B has hash values created for it to produce (5) an HB hash value and is compressed as a K compression (6) with run length coding and an ID so that ID + K + HB matches the cardinal numeral of data set B.
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申请公布号 |
DE10059320(A1) |
申请公布日期 |
2002.06.20 |
申请号 |
DE2000159320 |
申请日期 |
2000.11.29 |
申请人 |
PLATANISTA GMBH |
发明人 |
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分类号 |
G06T1/00;H04N1/32;(IPC1-7):H04L9/32 |
主分类号 |
G06T1/00 |
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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