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    • 75. 发明授权
    • Method and device for inserting and authenticating a digital signature in digital data
    • 用于在数字数据中插入和认证数字签名的方法和装置
    • US07216232B1
    • 2007-05-08
    • US09294956
    • 1999-04-20
    • Ingemar J. CoxMatthew L. MillerDouglas F. Rayner
    • Ingemar J. CoxMatthew L. MillerDouglas F. Rayner
    • H04L9/00
    • H04N1/32208G06T1/0021H04L9/3236H04L9/3247H04L2209/30H04L2209/608H04L2209/80H04N1/32128H04N1/32144H04N1/32229H04N1/32283H04N2101/00H04N2201/3233H04N2201/3269
    • A method for inserting a digital signature into digital data is provided. The digital data has bits and the method includes the steps of: assigning predetermined bits of the digital data for receiving the digital signature; signing the digital data excluding the predetermined bits resulting in the digital signature; and inserting the digital signature into the predetermined bits of the digital data for subsequent authentication of the digital data. Also provided is a method for authenticating digital data having the embedded digital signature in the predetermined bits of the digital data including the steps of: extracting the digital signature from the predetermined bits; decrypting the digital signature from the digital data resulting in a first hash; applying a known one-way hashing function used by an encoder of the digital data to the digital data excluding the predetermined bits resulting in a second hash; and comparing the first hash to the second hash wherein if the first hash matches the second hash the digital data is authentic. In a preferred version of the methods of the present invention, the method further includes the step of inserting associated data into the digital data prior to the signing step such that the digital signature authenticates both the associated data as well as the digital data. Preferably, the associated data is inserted into the bits of the digital data excluding the predetermined bits.
    • 提供了一种将数字签名插入数字数据的方法。 数字数据具有比特,并且该方法包括以下步骤:分配用于接收数字签名的数字数据的预定比特; 签署不包括导致数字签名的预定位的数字数据; 并将数字签名插入到数字数据的预定位中,以便后续的数字数据认证。 还提供了一种用于在数字数据的预定位中验证具有嵌入数字签名的数字数据的方法,包括以下步骤:从预定位提取数字签名; 从数字数据解密数字签名,得到第一个散列; 将由数字数据的编码器使用的已知单向散列函数应用于除了预定位之外的数字数据,导致第二散列; 以及将所述第一散列与所述第二散列进行比较,其中如果所述第一散列与所述第二散列匹配,则所述数字数据是可信的。 在本发明的方法的优选版本中,该方法还包括在签名步骤之前将相关联的数据插入到数字数据中的步骤,使得数字签名认证相关数据以及数字数据。 优选地,相关联的数据被插入除了预定比特之外的数字数据的比特中。
    • 77. 发明授权
    • Method for encoding bits in a signal
    • US06438252B1
    • 2002-08-20
    • US09817422
    • 2001-03-26
    • Matthew L. Miller
    • Matthew L. Miller
    • G06K900
    • A message in the form of a sequence of bits is encoded into relatively short, non-binary signals. The message (or vector) is divided into two halves. The encoder first determines an encoding of the message into a vector half the length of the eventual encoded vector. The half-length vector forms the first half of the encoded, and is negated to form the second half of the encoded vector. An identical synchronization signal is added to both halves of the encoded vector. The synchronization signal is used to compensate for the possibility that the received vector (or message) is cyclically rotated from the original vector. During decoding, the decoder first obtains the synchronization signal by adding the two halves of the vector together, canceling the encoded message. The synchronization signal is used to find the original cyclical shift of the vector. The decoder obtains the half-length encoded message vector by taking the difference between the two halves of the aligned full-length encoded vector. After decoding the vector into a bit sequence, the encoder re-encodes that bit sequence and compares the resulting vector with the original vector to determine whether the original vector truly encoded a message or was simply a noise signal.
    • 78. 发明授权
    • Method for inserting a watermark signal into data
    • 将水印信号插入数据的方法
    • US6128736A
    • 2000-10-03
    • US215958
    • 1998-12-18
    • Matthew L. Miller
    • Matthew L. Miller
    • G06T1/00G09C1/06G09C5/00H04N1/387H04N7/08H04N7/081H04L9/00G09C3/00
    • G06T1/0028
    • A method for inserting a watermark signal into data to be watermarked. The method includes the steps of: applying a partial watermark extraction to unwatermarked data for generating a first set of intermediate extracted values; identifying a first set of target values that are to replace the intermediate extracted values; computing the difference between the first set of target values and the first set of intermediate extracted values; and adding the computed difference throughout the unwatermarked data. In a preferred embodiment of the method of the present invention, the step of identifying a first set of target values that are to replace the intermediate extracted values further includes the substeps of: applying a transform to the first set of intermediate extracted values; applying a further partial watermark extraction to the transformed first set of intermediate extracted values to obtain a second set of intermediate extracted values; identifying a second set of target values that are to replace the second set of intermediate extracted values; computing the difference between the second set of target values and the second set of intermediate extracted values; adding the computed difference throughout the transformed first set of intermediate extracted values to obtain a transformed first set of target values; and applying an inverse transform to the first set of transformed target values to obtain the first set of target values.
    • 一种用于将水印信号插入要被加水印的数据的方法。 该方法包括以下步骤:对未加水印的数据应用部分水印提取以产生第一组中间提取值; 识别要替换中间提取值的第一组目标值; 计算第一组目标值与第一组中间提取值之间的差; 并将所计算出的差异添加到整个未水印的数据中。 在本发明方法的优选实施例中,识别要替换中间提取值的第一组目标值的步骤还包括以下子步骤:将变换应用于第一组中间提取值; 对所转换的第一组中间提取值应用进一步的部分水印提取以获得第二组中间提取值; 识别将替换第二组中间提取值的第二组目标值; 计算第二组目标值与第二组中间提取值之间的差; 将所计算出的差值加到经变换的第一组中间提取值,以获得经变换的第一组目标值; 以及将逆变换应用于所述第一组变换的目标值以获得所述第一组目标值。