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公开(公告)号：ES2364137T3
公开(公告)日：2011-08-25
申请号：ES03798478
申请日：2003-09-25
Applicant: PANASONIC CORP
Inventor： OHTA YUUSAKU , MATSUZAKI NATSUME , YAMAUCHI HIROKI , FUTA YUICHI
Abstract: Un dispositivo de comunicaciones para realizar transmisión y recepción de un contenido con otro dispositivo de comunicaciones (30) que pone un tiempo de vida de un paquete IP para transmitir a un valor predeterminado, incluyendo el dispositivo de comunicaciones (20): una unidad de adquisición operable para adquirir el tiempo de vida de un paquete IP recibido del otro dispositivo de comunicaciones (30); una unidad de determinación (106) operable para determinar si el tiempo de vida adquirido es menor o igual al valor predeterminado, determinándose el valor predeterminado con anterioridad entre el servidor de contenido (20) y el terminal (30); y una unidad de comunicaciones (101) operable para realizar transmisión/recepción de contenido con el otro dispositivo de comunicaciones (30) solamente cuando dicha unidad de determinación (106) ha determinado que el tiempo de vida adquirido es menor o igual al valor predeterminado, y para no realizar transmisión/recepción de contenido con el otro dispositivo de comunicaciones (30) cuando dicha unidad de determinación (106) ha determinado que el tiempo de vida adquirido es más grande que el valor predeterminado.
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公开(公告)号：DE602006012935D1
公开(公告)日：2010-04-29
申请号：DE602006012935
申请日：2006-01-17
Applicant: PANASONIC CORP
Inventor： FUTA YUICHI , HASEGAWA SHINGO , ISOBE SHUJI , OHMORI MOTOJI , SHIZUYA HIROKI
Abstract: 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.
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公开(公告)号：DE602004021906D1
公开(公告)日：2009-08-20
申请号：DE602004021906
申请日：2004-01-09
Applicant: PANASONIC CORP
Inventor： MATSUZAKI NATSUME , NAKANO TOSHIHISA , FUTA YUICHI
Abstract: Disclosed is a group admission system (1) having a client (200e-200g) and a server (100a-100d) that belongs to a closed group within which contents are available. The client (200e-200g) determines whether it is permissible to request to join the group to be a member device thereof based on the number of groups that the client (200e-200g) is permitted to be in. If permissible, the client (200e-200g) transmits a registration request to the server (100a-100d) with information unique to the client (200e-200g). The server (100a-100d) determines whether to permit the client (200e-200g) to join the group by registering with the server (100a-100d) based on the number of member devices registered with the server (100a-100d) and the maximum number of member devices registerable with the server (100a-100d).; If it is permitted, the server (100a-100d) registers the unique information, and transmits group identification information to the client (200e-200g). The client receives and stores the group identification information.
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公开(公告)号：ES2363517T3
公开(公告)日：2011-08-08
申请号：ES05727373
申请日：2005-03-24
Applicant: PANASONIC CORP
Inventor： NONAKA MASAO , FUTA YUICHI , NAKANO TOSHIHISA , YOKOTA KAORU , OHMORI MOTOJI , MIYAZAKI MASAYA , YAMAMOTO MASAYA , MURASE KAORU , ONODA SENICHI
Abstract: Un dispositivo de procesamiento de datos (1600; 4600) para la utilización de una obra digital (1120; 2120; 4120) registrada sobre un medio de registro (1500; 2500; 4500), que comprende: una unidad de utilización (1606; 2618) operativa para usar la obra digital (1120; 2120; 4120) y una unidad de control de la utilización operativa para detener la unidad de utilización (2618) con relación al uso de la obra digital (1120; 2120; 4120) si la obra digital (1120; 2120; 4120) no es válida, el medio de registro (1500; 2500; 4500) que tiene registrada en él la obra digital (1120; 2120; 4120) que está constituida por una pluralidad de bloques de datos (1231); el medio de registro (1500; 2500; 4500) que tiene registrado en él una pluralidad de valores de resumen de registros (1120; 2120; 4120) generados a partir de una pluralidad de bloques de datos (1231) que constituyen la obra digital y caracterizado por la pluralidad de valores de resumen del registro (1556; 4161, ..., 4166) usados para generar datos de firma del registro, sin excedente o escasez y el dispositivo de procesamiento de datos (1600; 4600) que comprende además: una unidad de selección (1611; 2105; 4611) que es operativa para seleccionar pseudo aleatoriamente un número predeterminado de bloques de datos de entre toda la pluralidad de bloques de datos (1231) en cada momento que se usa la obra digital (1120; 2120; 4120); una unidad de cálculo operativa para calcular los valores de resumen calculados (1556; 4161, ..., 4166) en base a los datos seleccionados; una unidad de lectura operativa para leer, dentro de la pluralidad de valores de resumen del registro (1556; 4161, ..., 4166), los valores de resumen del registro restantes que no incluyen un valor de resumen de registro que corresponde al valor de resumen de cálculo calculado; y una unidad de verificación de firma (1611; 2611; 4606) operativa para verificar si la obra digital (1120; 2120; 4120) es válida en base al registro de datos de firma (4170), todos los valores de resumen calculados y todos los valores de resumen del registro restantes.
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公开(公告)号：DE602005025615D1
公开(公告)日：2011-02-10
申请号：DE602005025615
申请日：2005-03-22
Applicant: PANASONIC CORP
Inventor： FUTA YUICHI , OHMORI MOTOJI , SHIZUYA HIROYUKI , MAMBO MASAHIRO , YAMAMICHI MASATO
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Patent Agency Ranking
公开(公告)号：AU2005227472B2
公开(公告)日：2010-12-09
申请号：AU2005227472
申请日：2005-03-24
Applicant: PANASONIC CORP
Inventor： MURASE KAORU , FUTA YUICHI , ONODA SENICHI , OHMORI MOTOJI , YOKOTA KAORU , YAMAMOTO MASAYA , NAKANO TOSHIHISA , MIYAZAKI MASAYA , NONAKA MASAO
Abstract: Processing load on an executing device for conducting playback is high during the playback of contents since the executing device performs verification of the contents validity in parallel with the contents playback, and therefore the executing device has to be equipped with a highly efficient processor. The present invention reduces the processing load involved in the verification by using, for the verification, only a predetermined number of encrypted units selected randomly from multiple encrypted units constituting encrypted contents recorded on the DVD. In addition, the present invention is capable of improving the accuracy of detecting unauthorized contents to some extent by randomly selecting a predetermined number of encrypted units every time the verification is performed.
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公开(公告)号：MY147696A
公开(公告)日：2013-01-15
申请号：MYPI20071319
申请日：2005-03-31
Applicant: PANASONIC CORP
Inventor： NONAKA MASAO , FUTA YUICHI , NAKANO TOSHIHISA , YOKOTA KAORU , OHMORI MOTOJI , MIYAZAKI MASAYA , YAMAMOTO MASAYA , MURASE KAORU , ONODA SENICHI
Abstract: AN EXECUTING DEVICE CONDUCTS PLAYBACK OF CONTENTS. THE EXECUTING DEVICE IS EQUIPPED WITH A HIGHLY EFFICIENT PROCESSOR AND REDUCES THE PROCESSING LOAD INVOLVED IN VERIFICATION BY USING, FOR THE VERIFICATION, ONLY A PREDETERMINED NUMBER OF ENCRYPTED UNITS SELECTED RANDOMLY FROM MULTIPLE ENCRYPTED UNITS CONSTITUTING ENCRYPTED CONTENTS RECORDED ON A DVD. IN ADDITION, THE EXECUTING DEVICE IS CAPABLE OF IMPROVING THE ACCURACY OF DETECTING UNAUTHORIZED CONTENTS BY RANDOMLY SELECTING A PREDETERMINED NUMBER OF ENCRYPTED UNITS EVERY TIME THE VERIFICATION IS PERFORMED.
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公开(公告)号：AT511270T
公开(公告)日：2011-06-15
申请号：AT03798478
申请日：2003-09-25
Applicant: PANASONIC CORP
Inventor： OHTA YUUSAKU , MATSUZAKI NATSUME , YAMAUCHI HIROKI , FUTA YUICHI
Abstract: In a server, an echo-request transmitting unit transmits echo-request data to a target device, and an echo-reply receiving unit receives echo-reply data from the target device. A time measuring unit measures, as the target time, the time required between transmission of the echo-request data and reception of the echo-reply data, and compares the target time with the reference time. In this way, the server judges whether the target device connected to its network belongs to a predetermined group.
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公开(公告)号：AT509321T
公开(公告)日：2011-05-15
申请号：AT05727373
申请日：2005-03-24
Applicant: PANASONIC CORP
Inventor： NONAKA MASAO , FUTA YUICHI , NAKANO TOSHIHISA , YOKOTA KAORU , OHMORI MOTOJI , MIYAZAKI MASAYA , YAMAMOTO MASAYA , MURASE KAORU , ONODA SENICHI
Abstract: Processing load on an executing device for conducting playback is high during the playback of contents since the executing device performs verification of the contents validity in parallel with the contents playback, and therefore the executing device has to be equipped with a highly efficient processor. The present invention reduces the processing load involved in the verification by using, for the verification, only a predetermined number of encrypted units selected randomly from multiple encrypted units constituting encrypted contents recorded on the DVD. In addition, the present invention is capable of improving the accuracy of detecting unauthorized contents to some extent by randomly selecting a predetermined number of encrypted units every time the verification is performed.
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公开(公告)号：NO326812B1
公开(公告)日：2009-02-23
申请号：NO20025013
申请日：2002-10-18
Applicant: PANASONIC CORP
Inventor： FUTA YUICHI , OHMORI MOTOJI , YOKOTA KAORU , TATEBAYASHI MAKOTO
IPC: H04L9/30
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