专利名称：METHOD AND APPARATUS FOR
WATERMARKING AND AUTHENTICATINGDATA
发明人：SUN, Qibin,CHANG, Shih-Fu,MAENO,
Kurato,SUTO, Masayuki
申请号：EP02800452.1申请日：20021003公开号：EP1452012A2公开日：20040901
摘要：A method and apparatus for watermarking and authenticating data. Featurescodes are derived from multimedia data (e.g., image data) and used to derive a quasi-random watermark and an encrypted signature. In two stages of watermarking, thequasi-random watermark and the signature are embedded in the multimedia data toderive watermarked data. In an authentication procedure, the watermarked data areauthenticated by newly deriving the feature codes, extracting the watermarks, anddetermining whether the extracted watermarks correspond to the newly derived featurecodes. In addition, the embedded signature is extracted from the data and decrypted.The newly derived feature codes are used to derive data which is compared to thedecrypted signature. The user of the above procedures can select a desiredauthentication strength based upon the percentage of the multimedia data used toderive the feature codes.
申请人：The Trustees of Columbia University in the City of New York
地址：116th Street and Broadway New York, NY 10027 US
国籍：US
代理机构：Lawrence, John
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