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    • 21. 发明授权
    • Content distribution system
    • 内容分发系统
    • US08601590B2
    • 2013-12-03
    • US11790609
    • 2007-04-26
    • Toshihisa NakanoMasao NonakaYuichi FutaMotoji OhmoriRyo NojimaKazukuni KobaraHideki Imai
    • Toshihisa NakanoMasao NonakaYuichi FutaMotoji OhmoriRyo NojimaKazukuni KobaraHideki Imai
    • G06F21/00G06F21/16G06F21/10
    • G06F21/16G06F21/10H04L9/14H04L9/3247H04L9/3263H04L2209/608
    • A content distribution system for transferring contents between transmission device and reception device. The transmission device includes: key obtaining unit that obtains, from reception device, public keys and public key identifiers; watermark embedding unit that embeds a different public key identifier, as electronic watermark, into each of contents that are identical in substance; an encryption unit that encrypts contents using public keys to generate encrypted contents; and transmission unit that transmits encrypted contents to reception device. The reception device includes: key storage unit storing public keys, public key identifiers, and a private key that makes a pair with one of the public keys; key transmission unit that transmits public keys and public key identifiers to the transmission device; content receiving unit that receives encrypted contents from transmission device; and decryption unit that obtains a content from the received encrypted contents, using the private key.
    • 一种用于在传输设备和接收设备之间传送内容的内容分发系统。 传输设备包括:密钥获取单元,从接收设备获取公钥和公开密钥标识符; 水印嵌入单元将不同的公钥标识符作为电子水印嵌入到实质上相同的每个内容中; 加密单元,其使用公共密钥对内容进行加密以生成加密内容; 以及将加密内容发送到接收装置的发送单元。 接收装置包括:存储公共密钥的密钥存储单元,公开密钥标识符和与公钥之一成对的专用密钥; 密钥发送单元,向发送装置发送公开密钥和公开密钥标识符; 从发送装置接收加密内容的内容接收单元; 以及使用私钥从所接收的加密内容中获取内容的解密单元。
    • 25. 发明申请
    • Program conversion device, and secret keeping program
    • 程序转换装置,秘密保存程序
    • US20090217008A1
    • 2009-08-27
    • US11918785
    • 2006-04-21
    • Taichi SatoMotoji OhmoriRieko AsaiYuichi FutaTomoyuki HagaMasahiro Mambo
    • Taichi SatoMotoji OhmoriRieko AsaiYuichi FutaTomoyuki HagaMasahiro Mambo
    • G06F9/302G06F9/30
    • G06F21/54G06F21/125G06F21/14
    • Provided is a program conversion apparatus for generating a secret holding program, which disables a malicious analyzer from analyzing the an original program easily.The program conversion apparatus generates a first instruction group for acquiring values to assign to selection parameters; a second instruction group that includes an instruction group for acquiring, based on an arithmetic expression that uses the selection parameters, a selection identifier showing a selection-target data piece to be processed next; a third instruction group for updates a value of each selection parameter so as to reflect one of (a) a selection identifier showing one of the selection-target data pieces that has already been processed, and (b) at least one of one or more values that have already been assigned to the selection parameters; and selection-target data pieces that, by processing in a predetermined order, output an execution result identical to a result of the original program, each of the selection-target data pieces being in correspondence with a different selection identifier. The program conversion apparatus generates the secret holding program so as to include the first instruction group, the second instruction group, the third instruction group and the selection-target data pieces.
    • 提供了一种用于生成秘密保持程序的程序转换装置,其禁止恶意分析器容易地分析原始程序。 程序转换装置生成用于获取分配给选择参数的值的第一指令组; 第二指令组,其包括用于基于使用所述选择参数的算术表达式获取示出接下来要处理的选择目标数据块的选择标识符的指令组; 第三指令组,用于更新每个选择参数的值,以便反映(a)表示已经被处理的选择目标数据段之一的选择标识符之一,以及(b)一个或多个 已经分配给选择参数的值; 以及选择目标数据,通过按预定顺序处理,输出与原始程序的结果相同的执行结果,每个选择对象数据段与不同的选择标识符相对应。 程序转换装置生成秘密保持程序,以包括第一指令组,第二指令组,第三指令组和选择目标数据。
    • 30. 发明申请
    • Prime calculation device,method,and key issuing system
    • 主要计算装置,方法和钥匙发放系统
    • US20070121934A1
    • 2007-05-31
    • US10582803
    • 2004-12-21
    • Yuichi FutaMotoji Ohmori
    • Yuichi FutaMotoji Ohmori
    • H04L9/28
    • G06F17/10G06F7/72G06F2207/7204H04L9/3033H04L2209/08
    • The present invention offers a prime calculating apparatus for achieving prime calculation where producing identical primes is avoided by simple management techniques. The prime calculating apparatus stores a known prime q and management information unique in the use range of primes. The prime calculating apparatus reads the management information; generates random information R based on the read management information; reads prime q; calculates prime candidate N, according to N=2×random information R×prime q+1, using the read prime q and generated random information R; tests whether the calculated prime candidate N is a prime; and outputs the calculated prime candidate N as a prime when the primality of the calculated prime candidate N is determined. Herewith, the prime calculating apparatus is able to calculate prime candidates from unique management information while avoiding producing identical primes.
    • 本发明提供了一种用于实现主要计算的主要计算装置,其中通过简单的管理技术来避免产生相同的素数。 主计算装置存储在素数的使用范围中唯一的已知素数q和管理信息。 主计算装置读取管理信息; 基于读取的管理信息生成随机信息R; 读q 根据N = 2x随机信息Rxprime q + 1,使用读取素数q和生成的随机信息R来计算素数候选N; 测试所计算的素数候选N是否为素数; 并且当确定所计算的素数候选N的原语时,将所计算的素数候选N作为素数输出。 因此,主计算装置能够从唯一的管理信息计算主要候选者,同时避免产生相同的素数。