COMMUNICATION DEVICE AND COMMUNICATION SYSTEM
    41.
    发明申请
    COMMUNICATION DEVICE AND COMMUNICATION SYSTEM 审中-公开
    通信设备和通信系统

    公开(公告)号:US20090100264A1

    公开(公告)日:2009-04-16

    申请号:US12298579

    申请日:2007-04-23

    IPC分类号: H04L9/32 H04L9/08

    摘要: A communication device is secure against an impersonation attack as well. The communication device secretly communicates, with an external device, target data with use of a key shared with the external device. Without being known to a third party, the communication device generates a key shared with the external device using a scheme of which security is proved. Validity of the external device is determined by authentication with use of a key dependent function that is shared with the external device and is dependent on the shared key. If the external device is determined to be valid, for secretly communicating the target data, verification data for verifying validity of the target data is generated from the target data with use of the key dependent function.

    摘要翻译: 通信设备也是安全的,以防止模拟攻击。 通信设备秘密地使用外部设备共享的密钥与外部设备通信目标数据。 通信设备在不被第三方知道的情况下,使用证明了哪种安全性的方案来生成与外部设备共享的密钥。 外部设备的有效性通过使用与外部设备共享的密钥相关功能的认证来确定,并且取决于共享密钥。 如果外部设备被确定为有效,则秘密地传送目标数据,则使用密钥相关函数从目标数据生成用于验证目标数据的有效性的验证数据。

    Rental system
    42.
    发明授权
    Rental system 失效
    租赁系统

    公开(公告)号:US07426494B2

    公开(公告)日:2008-09-16

    申请号:US10161675

    申请日:2002-06-05

    IPC分类号: G06Q99/00

    CPC分类号: G11B20/00086 G11B20/00855

    摘要: At the time of manufacturing a DVD to be provided to a rental agent, a provider device writes an agent-rental expiry along with contents onto the DVD. At the time of renting the DVD to a user, a rental agent device writes a user-expiry onto the DVD. A DVD player acquires a current time from a time source device, and compares the current time with each of a prior time, the agent-rental expiry, and the user-rental expiry. The DVD player plays back the content only when playback conditions are met.

    摘要翻译: 在制造要提供给租赁代理的DVD时,提供者设备将代理租赁期满以及内容写入DVD。 在将DVD租给用户时,租赁代理设备将用户到期书写到DVD上。 DVD播放器从时间源设备获取当前时间,并将当前时间与先前时间,代理租赁到期期限和用户租赁到期时间进行比较。 DVD播放机仅在播放条件满足时播放内容。

    Signature Generation Device, Key Generation Device, and Signature Generation Method
    43.
    发明申请
    Signature Generation Device, Key Generation Device, and Signature Generation Method 有权
    签名生成装置,密钥生成装置和签名生成方法

    公开(公告)号:US20080089514A1

    公开(公告)日:2008-04-17

    申请号:US11795256

    申请日:2006-01-17

    IPC分类号: H04L9/30

    摘要: There is provided a signature generation apparatus capable of preventing transcript attack on signature data. The signature generation apparatus for generating signature data for message data (i) acquires, according to a predetermined acquisition method, a private key, which is different from a private key used in a previous digital signature operation, from among a plurality of private keys generated using a key generation method of a signature scheme in which the plurality of private keys correspond to a single public key, and (ii) performs, using the acquired private key, a digital signature operation on the message data according to a signature method of the signature scheme to generate the signature data.

    摘要翻译: 提供了能够防止对签名数据的转录攻击的签名生成装置。 用于生成消息数据的签名数据的签名生成装置(i)根据预定的获取方法从生成的多个私钥中获取与先前的数字签名操作中使用的私钥不同的私钥 使用其中所述多个私钥对应于单个公钥的签名方案的密钥生成方法,以及(ii)使用所获取的私钥对所述消息数据执行数字签名操作,所述签名方法根据所述签名方法 签名方案生成签名数据。

    Content distribution system
    45.
    发明申请
    Content distribution system 有权
    内容分发系统

    公开(公告)号:US20070256141A1

    公开(公告)日:2007-11-01

    申请号:US11790609

    申请日:2007-04-26

    IPC分类号: H04L9/32

    摘要: 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.

    摘要翻译: 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; 以及使用所述私钥从所接收的加密内容中获取内容的解密单元。

    Information transfer system, encryption device, and decryption device
    46.
    发明申请
    Information transfer system, encryption device, and decryption device 有权
    信息传输系统,加密装置和解密装置

    公开(公告)号:US20070121933A1

    公开(公告)日:2007-05-31

    申请号:US10572457

    申请日:2004-10-01

    IPC分类号: H04K3/00

    摘要: To provide a content delivery system which enables a ciphertext to be reduced in size when using the ElGamal cipher. A content delivery device performs elliptic curve encryption on a content key, generates an encrypted content key that includes an x coordinate of an elliptic curve point obtained by the elliptic curve encryption, and outputs the encrypted content key. A content reception device receives the encrypted content key, and calculates a y coordinate of the elliptic curve point using the x coordinate included in the encrypted content key. The content reception device then performs elliptic curve decryption using the elliptic curve point and other information included in the encrypted content key, to generate a decrypted content key.

    摘要翻译: 提供一种内容传送系统,该系统能够在使用ElGamal密码时使密文大小减小。 内容发送装置对内容密钥执行椭圆曲线加密,生成包含通过椭圆曲线加密获得的椭圆曲线点的x坐标的加密内容密钥,并输出加密的内容密钥。 内容接收装置接收加密的内容密钥,并使用包含在加密的内容密钥中的x坐标来计算椭圆曲线点的y坐标。 然后,内容接收装置使用椭圆曲线点和包括在加密内容密钥中的其他信息来执行椭圆曲线解密,以产生解密的内容密钥。

    Cryptocommunication system, transmission apparatus, and reception apparatus
    47.
    发明授权
    Cryptocommunication system, transmission apparatus, and reception apparatus 失效
    加密通信系统,发送装置和接收装置

    公开(公告)号:US07155610B2

    公开(公告)日:2006-12-26

    申请号:US10020308

    申请日:2001-12-18

    IPC分类号: H04L9/00

    CPC分类号: H04L9/3236

    摘要: A transmission apparatus performs a one-way operation on plaintext to generate a first value and transmits the first value, generates first additional information, performs an invertible operation on the plaintext and first additional information to generate connected information, encrypts the connected information using an encryption algorithm to generate ciphertext, and transmits the ciphertext. A reception apparatus receives the first value and the ciphertext, generates second additional information identical to the first additional information, decrypts the ciphertext using a decryption algorithm, which is an inverse-conversion of the encryption algorithm, to generate decrypted connected information, decrypts the decrypted connected information and the second additional information according to an inverse of the invertible operation to generate decrypted text, performs the one-way operation on the decrypted text to generate a second value, compares the first and second values, and judges that the decrypted text is valid only when the first and second values match.

    摘要翻译: 发送装置对明文执行单向操作以生成第一值并发送第一值,生成第一附加信息,对明文执行可逆操作和第一附加信息以生成连接信息,使用加密来加密所连接的信息 算法生成密文,并发送密文。 接收装置接收第一值和密文,生成与第一附加信息相同的第二附加信息,使用作为加密算法的逆变换的解密算法对密文进行解密,生成解密的连接信息,解密解密的 连接信息和第二附加信息,根据可逆操作的反向产生解密文本,对解密文本执行单向操作以生成第二值,比较第一和第二值,并且判断解密文本是 仅当第一个和第二个值匹配时才有效。

    Game system, game execution apparatus, and portable storage medium
    48.
    发明授权
    Game system, game execution apparatus, and portable storage medium 有权
    游戏系统,游戏执行装置和便携式存储介质

    公开(公告)号:US08740698B2

    公开(公告)日:2014-06-03

    申请号:US13224428

    申请日:2011-09-02

    IPC分类号: A63F9/24 G07F17/32 A63F13/12

    摘要: A game system in which game software produced to be used in stationary game machines can be used in portable game machines. The game system includes a stationary game machine, a portable game machine, and a memory card connectable to both the stationary and portable game machines. Image data contained in game software produced for the stationary game machine shows an image in the form of free-form surface. The stationary game machine converts the image data to show the image in the form of a polygon according to processing performance of the portable game machine, and stores the converted image data and a game program executable by the portable game machine onto the memory card. The portable game machine executes the game program stored on the memory card, and generates and displays a display image from the image data stored on the memory card.

    摘要翻译: 可以在便携式游戏机中使用生产用于固定式游戏机的游戏软件的游戏系统。 游戏系统包括固定式游戏机,便携式游戏机和可连接到固定式和便携式游戏机两者的存储卡。 为固定游戏机制作的游戏软件中包含的图像数据以自由曲面的形式显示图像。 固定游戏机根据便携式游戏机的处理性能,将图像数据转换为多边形的图像,并将转换的图像数据和便携式游戏机可执行的游戏程序存储到存储卡上。 便携式游戏机执行存储在存储卡上的游戏程序,并从存储在存储卡上的图像数据中生成并显示显示图像。