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    Copy-guard system and information recording medium used in the same system
    2.
    发明授权
    Copy-guard system and information recording medium used in the same system 失效
    复制保护系统和信息记录介质在同一系统中使用

    公开(公告)号：US06556679B1

    公开(公告)日：2003-04-29

    申请号：US09195914

    申请日：1998-11-19

    申请人： Takehisa Kato ,  Taku Katoh ,  Kenjiro Endoh ,  Hisashi Yamada ,  Naoki Endoh

    发明人： Takehisa Kato ,  Taku Katoh ,  Kenjiro Endoh ,  Hisashi Yamada ,  Naoki Endoh

    IPC分类号： H04N7167

    CPC分类号： G11B20/0021 ,  G11B20/00086 ,  G11B20/00166 ,  G11B20/18 ,  H04N5/913 ,  H04N5/945 ,  H04N2005/91328 ,  H04N2005/91364

    摘要： In an embodiment, a copy-guard system is provided that includes a decoding section for decoding digital data, which is encoded and error-correction-coded, from an information recording medium in which key information encoded for the digital data is recorded, an encoded digital data acquisition section for acquiring digital data encoded by error-correcting the digital data decoded by the decoding section, a detection section for detecting an error position and an error symbol value of the encoded digital data, identification information detection section for detecting an identification information representing whether the information recording medium is original or copied and which is replaced with a part of the digital data encoded and error-correction-coded, based on the error position and the error symbol value detected by the detection section, a determination section for determining whether a copy of the information recording medium is protected, and a copy protection section.

    摘要翻译： 在一个实施例中，提供了一种复制保护系统，其包括：解码部分，用于从其中记录用于数字数据编码的密钥信息的信息记录介质对由数字数据进行编码和纠错编码的数字数据进行解码， 数字数据获取部分，用于获取通过对由解码部分解码的数字数据进行纠错编码的数字数据，检测部分，用于检测编码数字数据的错误位置和误差符号值;识别信息检测部分，用于检测识别信息 表示信息记录介质是原始还是复制的，并且基于由检测部分检测的错误位置和错误符号值，被编码和纠错编码的数字数据的一部分替代，确定部分，用于确定 信息记录介质的副本是否被保护，以及复制保护部分。

    Multimedia adaptive scrambling system (MASS)
    3.
    发明授权
    Multimedia adaptive scrambling system (MASS) 失效
    多媒体自适应加扰系统（MASS）

    公开(公告)号：US06888943B1

    公开(公告)日：2005-05-03

    申请号：US09692084

    申请日：2000-10-19

    申请人： Katherine S. Lam ,  Kamran Moallemi ,  Chong U. Lee ,  Taku Katoh ,  Naoki Endoh

    发明人： Katherine S. Lam ,  Kamran Moallemi ,  Chong U. Lee ,  Taku Katoh ,  Naoki Endoh

    IPC分类号： H04K1/00 ,  H04N7/167 ,  H04L9/00 ,  H03K17/92

    CPC分类号： H04N21/44055 ,  G11B20/0021 ,  G11B20/00507 ,  H04K1/00 ,  H04L9/0656 ,  H04L2209/60 ,  H04N7/1675 ,  H04N21/23476 ,  H04N21/23892 ,  H04N21/26613

    摘要： A system (300, 500) for scrambling digital samples (115, 200, 250, 260, 270) of multimedia data, including audio and video data samples, such that the content of the samples is degraded but still recognizable, or otherwise provided at a desired quality level. The samples may be in any conceivable compressed or uncompressed digital format, including Pulse Code Modulation (PCM) samples, samples in floating point representation, samples in companding schemes (e.g., μ-law and A-law), and other compressed bit streams. The quality level may be associated with a particular signal to noise ratio, or quality level that is determined by objective and/or subjective tests, for example. A number of LSBs can be scrambled in successive samples in successive frames (FRAME A, FRAME B, FRAME C). Moreover, the parameters for scrambling may change from frame to frame. Furthermore, all or part of the scrambling key (310) can be embedded (340) in the scrambled data and recovered at a decoder (400, 600) to be used in descrambling. After descrambling, the scramble key is no longer recoverable because the scramble key itself is scrambled by the descrambler.

    摘要翻译： 一种用于对包括音频和视频数据样本的多媒体数据的数字样本（115,200,250,260,270）进行加扰的系统（300,500），使得样本的内容降级但仍可识别，或以其他方式提供 期望的质量水平。 样本可以是任何可想到的压缩或未压缩的数字格式，包括脉冲编码调制（PCM）样本，浮点表示中的采样，压缩方案中的采样（例如，μ律和A律）以及其他压缩比特流。 质量水平可能与特定的信噪比或由客观和/或主观测试所确定的质量水平相关联。 可以在连续帧（FRAME A，FRAME B，FRAME C）中的连续采样中对多个LSB进行加扰。 此外，用于加扰的参数可以从帧到帧改变。 此外，加扰密钥（310）的全部或部分可以被嵌入（340）在加扰数据中，并在解码器（400,600）中被恢复以用于解扰。 解扰后，加密密钥本身由解扰器加扰，不再可恢复。

    Encrypted communication system that limits the damage caused when a secret key has been leaked
    6.
    发明授权
    Encrypted communication system that limits the damage caused when a secret key has been leaked 失效
    加密通信系统，限制秘密密钥泄露时造成的损坏

    公开(公告)号：US6151394A

    公开(公告)日：2000-11-21

    申请号：US940052

    申请日：1997-09-30

    申请人： Makoto Tatebayashi ,  Yoshihisa Fukushima ,  Takehisa Kato ,  Naoki Endoh ,  Koichi Hirayama

    发明人： Makoto Tatebayashi ,  Yoshihisa Fukushima ,  Takehisa Kato ,  Naoki Endoh ,  Koichi Hirayama

    IPC分类号： H04L9/08 ,  H04L9/00

    CPC分类号： H04L9/0833 ,  H04L9/0822

    摘要： In an encrypted transmission system composed of one transmission apparatus 10 and twenty-eight reception apparatuses A1-G4 that are classified into seven groups A-G, two secret key exclusively selected out of a total of fourteen secret keys are distributed beforehand to each group. The transmission apparatus 10 encrypts the same message M using one of the two secret keys distributed to each group and sends each group a message M encrypted with one of the group's secret keys. The reception apparatuses each decrypt the received cryptogram separately using each of the secret keys assigned to the of group to which each reception apparatus belongs, judge whether either of the two decryption results conforms to a predetermined rule, and specify the correct decryption result.

    摘要翻译： 在由分组为七组A-G的一个发送装置10和二十八个接收装置A1-G4组成的加密传输系统中，预先向每个组分发从总共14个秘密密钥中唯一选择的两个秘密密钥。 发送装置10使用分配给每个组的两个秘密密钥中的一个对相同的消息M进行加密，并且向每个组发送用该组的秘密密钥之一加密的消息M. 接收装置分别使用分配给每个接收装置所属的组的每个秘密密钥来分别接收密码，判断两个解密结果是否符合预定规则，并指定正确的解密结果。

    Secret key transfer method which is highly secure and can restrict the damage caused when the secret key is leaked or decoded
    9.
    发明授权
    Secret key transfer method which is highly secure and can restrict the damage caused when the secret key is leaked or decoded 有权
    秘密密钥传输方法，高度安全，可以限制秘密密钥泄漏或解码时造成的损害

    公开(公告)号：US6160890A

    公开(公告)日：2000-12-12

    申请号：US470250

    申请日：1999-12-22

    申请人： Makoto Tatebayashi ,  Motoji Ohmori ,  Takehisa Kato ,  Naoki Endoh ,  Koichi Hirayama

    发明人： Makoto Tatebayashi ,  Motoji Ohmori ,  Takehisa Kato ,  Naoki Endoh ,  Koichi Hirayama

    IPC分类号： H04L9/08 ,  H04N7/167 ,  H04N21/6334 ,  H04L9/00

    CPC分类号： H04N21/63345 ,  H04L9/0838 ,  H04L9/0891 ,  H04N7/1675

    摘要： A transmission apparatus 100 includes a secret key storage unit 103 that stores three secret keys K1, K2 and K3, a secret key selection unit 104 that selects one secret key Ks from the secret keys, a message generation unit 106 for generating a message M used as a carrier for indicating a secret key, an encryption module 105 for generating a cryptogram Ca by encrypting the generated message M using the secret key Ks, an encryption module 107 for generating a cryptogram Cm by encrypting the message M using the message M itself as the secret key, and two transmission units 111 and 112 for transmitting the cryptograms Ca and Cm to the reception apparatus 200 to indicate the selected secret key Ks. The reception apparatus 200 includes a decryption module, such as 221, for generating decrypted data Mi by decrypting the cryptogram Ca using a secret key Ki out of the three secret keys, and a decryption module, such as 222, for generating decrypted data Mii by decrypting the cryptogram Cm using the decrypted data Mi, and authorizes that the secret key Ki has been selected when the decrypted data Mi matches the decrypted data Mii.

    摘要翻译： 发送装置100包括存储三个秘密密钥K1，K2和K3的秘密密钥存储单元103，从密钥中选择一个秘密密钥Ks的秘密密钥选择单元104，用于生成使用的消息M的消息生成单元106 作为用于指示秘密密钥的载体，用于通过使用秘密密钥Ks加密生成的消息M来生成密码Ca的加密模块105，用于通过使用消息M自身通过加密消息M来生成密码Cm的加密模块107 秘密密钥和用于将密码Ca和Cm发送到接收装置200的两个发送单元111和112，以指示所选择的秘密密钥Ks。 接收装置200包括用于通过使用三个秘密密钥中的秘密密钥Ki对密码Ca进行解密来生成解密数据Mi的解密模块，以及用于通过以下方式生成解密数据Mii的解密模块： 使用解密数据Mi解密密码Cm，并且授权当解密数据Mi与解密数据Mii匹配时已经选择了秘密密钥Ki。