Signature Generation Apparatus and Signature Verification Apparatus
    41.
    发明申请
    Signature Generation Apparatus and Signature Verification Apparatus 有权
    签名生成装置和签名验证装置

    公开(公告)号:US20080282089A1

    公开(公告)日:2008-11-13

    申请号:US11578432

    申请日:2006-03-14

    IPC分类号: H04L9/06

    摘要: A signature generation apparatus and a signature verification apparatus which can prevent the occurrence of norm zero vector forgery attack. The signature generation apparatus (110) includes a signature generation unit (114) which generates signature data (S) for a message (m) using a private key stored in a private key storage unit (112), and converts the format of the signature data (S) so that the first sub-element of the N sub-elements in the signature data (S) indicates 0 without changing the norm of the signature data (S). The signature verification apparatus (120) includes a signature verification unit (124) which judges whether or not the first sub-element of the N sub-elements included in the signature data (S) indicates 0, and determines the signature data (S) as unauthorized data when judging that it is not 0.

    摘要翻译: 签名生成装置和签名验证装置,其能够防止零向量伪造攻击的发生。 签名生成装置(110)具有使用存储在专用密钥存储部(112)中的专用密钥来生成消息(m)的签名数据(S)的签名生成部(114),并将签名的格式 数据(S),使得签名数据(S)中的N个子元素的第一子元素指示0而不改变签名数据(S)的范围。 签名验证装置(120)包括签名验证单元(124),其判断包括在签名数据(S)中的N个子元素的第一子元素是否指示0,并且确定签名数据(S) 作为未经授权的数据,当判断为不为0时。

    Distribution system, distribution apparatus, and reception apparatus for distributing contents having usage expiry
    42.
    发明授权
    Distribution system, distribution apparatus, and reception apparatus for distributing contents having usage expiry 有权
    用于分发具有使用期满的内容的分发系统,配送装置和接收装置

    公开(公告)号:US07386618B2

    公开(公告)日:2008-06-10

    申请号:US10431500

    申请日:2003-05-08

    IPC分类号: G06F15/16

    CPC分类号: G06F21/10 G06F2221/2137

    摘要: A reception apparatus includes a first timer and sends to a distribution apparatus a first date-time clocked by the first timer. The distributing apparatus includes a second timer, and generates expiry information based on a difference obtained by subtracting, from the first date-time, a second date-time that is clocked by the second timer. The expiry information is used to adjust a usage expiry date-time of content. The reception apparatus judges whether playback of the content is permitted based on the first timer and the expiry information. With this arrangement, unauthorized use of the content beyond the expiry date-time is prevented.

    摘要翻译: 接收装置包括第一定时器,并且向配送装置发送由第一定时器计时的第一日期时间。 分发装置包括第二定时器,并且基于通过从第一日期时间减去由第二定时器计时的第二日期时间而获得的差产生到期信息。 过期信息用于调整内容的使用期限日期时间。 接收装置基于第一定时器和到期信息判断是否允许内容的回放。 通过这种安排,防止超出期满日期时间的内容的未经授权的使用。

    Program converter, encrypting device, and encrypting method
    43.
    发明授权
    Program converter, encrypting device, and encrypting method 有权
    程序转换器,加密设备和加密方法

    公开(公告)号:US08184805B2

    公开(公告)日:2012-05-22

    申请号:US12756440

    申请日:2010-04-08

    IPC分类号: G06F21/00

    CPC分类号: H04L9/0662 H04L2209/12

    摘要: A program converter (1) converts a program (P) which performs arithmetic addition processing to execute encryption, into a converted program (tP) which performs processing equivalent to the processing of the program (P). The program converter (1) includes: a key data extraction unit (10) which extracts key data from the program (P); an addition table generation unit (11) which generates an addition table from the extracted key data; a conversion table extraction unit (12) which extracts a conversion table from the program (P); a table merger unit (13) which generates a merger table by merging the generated addition table and the extracted conversion table; a random number generation unit (14) which generates a random number; a table randomization unit (15) which generates a randomized merger table by randomizing the merger table using the generated random number; and a converted-program generation unit (16) which generates the converted program (tP) according to the generated randomized merger table.

    摘要翻译: 程序转换器(1)将执行加法处理的程序(P)转换为执行与程序(P)的处理相当的处理的转换程序(tP)。 程序转换器(1)包括:从程序(P)提取密钥数据的密钥数据提取单元(10); 附加表生成单元,从所提取的密钥数据生成加法表; 转换表提取单元,从程序(P)中提取转换表; 表合并单元,其通过将所生成的加法表与所提取的转换表合并来生成合并表; 产生随机数的随机数生成单元(14); 表格随机化单元,其通过使用所生成的随机数随机化所述合并表来生成随机化合并表; 以及根据生成的随机合并表生成转换程序(tP)的转换程序生成单元(16)。

    PROGRAM CONVERTER, ENCRYPTING DEVICE, AND ENCRYPTING METHOD
    46.
    发明申请
    PROGRAM CONVERTER, ENCRYPTING DEVICE, AND ENCRYPTING METHOD 有权
    程序转换器,加密设备和加密方法

    公开(公告)号:US20100195822A1

    公开(公告)日:2010-08-05

    申请号:US12756440

    申请日:2010-04-08

    IPC分类号: H04L9/28

    CPC分类号: H04L9/0662 H04L2209/12

    摘要: A program converter (1) converts a program (P) which performs arithmetic addition processing to execute encryption, into a converted program (tP) which performs processing equivalent to the processing of the program (P). The program converter (1) includes: a key data extraction unit (10) which extracts key data from the program (P); an addition table generation unit (11) which generates an addition table from the extracted key data; a conversion table extraction unit (12) which extracts a conversion table from the program (P); a table merger unit (13) which generates a merger table by merging the generated addition table and the extracted conversion table; a random number generation unit (14) which generates a random number; a table randomization unit (15) which generates a randomized merger table by randomizing the merger table using the generated random number; and a converted-program generation unit (16) which generates the converted program (tP) according to the generated randomized merger table.

    摘要翻译: 程序转换器(1)将执行加法处理的程序(P)转换为执行与程序(P)的处理相当的处理的转换程序(tP)。 程序转换器(1)包括:从程序(P)提取密钥数据的密钥数据提取单元(10); 附加表生成单元,从所提取的密钥数据生成加法表; 转换表提取单元,从程序(P)中提取转换表; 表合并单元,其通过将所生成的加法表与所提取的转换表合并来生成合并表; 产生随机数的随机数生成单元(14); 表格随机化单元,其通过使用所生成的随机数随机化所述合并表来生成随机化合并表; 以及根据生成的随机合并表生成转换程序(tP)的转换程序生成单元(16)。

    Signature generation apparatus and signature verification apparatus
    47.
    发明授权
    Signature generation apparatus and signature verification apparatus 有权
    签名生成装置和签名验证装置

    公开(公告)号:US07739504B2

    公开(公告)日:2010-06-15

    申请号:US11578432

    申请日:2006-03-14

    IPC分类号: H04L9/30

    摘要: A signature generation apparatus and a signature verification apparatus which can prevent the occurrence of norm zero vector forgery attack. The signature generation apparatus (110) includes a signature generation unit (114) which generates signature data (S) for a message (m) using a private key stored in a private key storage unit (112), and converts the format of the signature data (S) so that the first sub-element of the N sub-elements in the signature data (S) indicates 0 without changing the norm of the signature data (S). The signature verification apparatus (120) includes a signature verification unit (124) which judges whether or not the first sub-element of the N sub-elements included in the signature data (S) indicates 0, and determines the signature data (S) as unauthorized data when judging that it is not 0.

    摘要翻译: 签名生成装置和签名验证装置,其能够防止零向量伪造攻击的发生。 签名生成装置(110)具有使用存储在专用密钥存储部(112)中的专用密钥来生成消息(m)的签名数据(S)的签名生成部(114),并将签名的格式 数据(S),使得签名数据(S)中的N个子元素的第一子元素指示0而不改变签名数据(S)的范围。 签名验证装置(120)包括签名验证单元(124),其判断包括在签名数据(S)中的N个子元素的第一子元素是否指示0,并且确定签名数据(S) 作为未经授权的数据,当判断为不为0时。

    COMMUNICATION DEVICE AND COMMUNICATION SYSTEM
    48.
    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
    49.
    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
    50.
    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。