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1. 发明公开

EP1251422A3 Copyright protection system and method thereof 审中-公开
标题翻译：版权保护系统及其方法
公开(公告)号：EP1251422A3
公开(公告)日：2005-04-20
申请号：EP02008212.9
申请日：2002-04-17
申请人： NEC CORPORATION
发明人： Morishita, Takuya , Miyauchi, Hiroshi , Minematsu, Kazuhiko , Obana, Satoshi
IPC分类号： G06F1/00
CPC分类号： G06F21/10 , G06F2221/2103 , G06F2221/2107
摘要： It is characterized to comprise an authentication device 4 having invalid information of a key in relation to cryptology, and for disapproving authentication in case that information of an authentication key is included in the invalid information, which is used for authentication when a first cryptographic key in relation to encrypting is shared between a first encrypting device 3 and a first decryption section 11, and an certificate revocation list updating device 5 for updating contents of the invalid information in the authentication device 4 when receiving information of a key of an object to be invalidated, which is provided together with an input data in relation to a work.

2. 发明授权

EP1283616B1 Zero-knowledge proving system and method 有权
标题翻译：使用零知识协议的方法和设备
公开(公告)号：EP1283616B1
公开(公告)日：2007-06-13
申请号：EP02017697.0
申请日：2002-08-07
申请人： NEC Corporation
发明人： Furukawa, Jun, , Sako, Kazue , Obana, Satoshi
IPC分类号： H04L9/32
CPC分类号： H04L9/3218 , H04L9/0643 , H04L9/0662 , H04L9/3013 , H04L9/3271

3. 发明公开

EP1283616A3 Zero-knowledge proving system and method 有权
标题翻译：使用零知识协议的方法和设备
公开(公告)号：EP1283616A3
公开(公告)日：2004-05-12
申请号：EP02017697.0
申请日：2002-08-07
申请人： NEC CORPORATION
发明人： Furukawa, Jun, , Sako, Kazue , Obana, Satoshi
IPC分类号： H04L9/32
CPC分类号： H04L9/3218 , H04L9/0643 , H04L9/0662 , H04L9/3013 , H04L9/3271
摘要： A zero-knowledge proving system includes a proving mechanism for proving equality or inequality of two discrete logarithms and a verifying mechanism for verifying said equality or inequality. The proving mechanism stores public information including a designated operation scheme, two input numbers α and β, and two predetermined bases g and h, private information x which is a discrete logarithm of α to the base g. After converting α, β and h to produce α', β' and γ' as follows: α' = α r ; β' = β r ; and γ' = h xr , the equality of a log α α' and log β β' and the equality of log g α' and log h γ' are proved. The verifying mechanism verifies the equality of a log α α' and log β β' and the equality of log g α' and loq h γ'. Then, the received β' and γ' are checked to determine the equality or inequality thereof, and it is determined whether the proof is acceptable, depending on the verification and the check results.

4. 发明公开

EP1283616A2 Zero-knowledge proving system and method 有权
标题翻译： Verfahren und Vorrichtung unter Verwendung eines Null-Kenntnisprotokolls
公开(公告)号：EP1283616A2
公开(公告)日：2003-02-12
申请号：EP02017697.0
申请日：2002-08-07
申请人： NEC CORPORATION
发明人： Furukawa, Jun, , Sako, Kazue , Obana, Satoshi
IPC分类号： H04L9/32
CPC分类号： H04L9/3218 , H04L9/0643 , H04L9/0662 , H04L9/3013 , H04L9/3271
摘要： A zero-knowledge proving system includes a proving mechanism for proving equality or inequality of two discrete logarithms and a verifying mechanism for verifying said equality or inequality. The proving mechanism stores public information including a designated operation scheme, two input numbers α and β, and two predetermined bases g and h, private information x which is a discrete logarithm of α to the base g. After converting α, β and h to produce α', β' and γ' as follows: α' = α r ; β' = β r ; and γ' = h xr , the equality of a log α α' and log β β' and the equality of log g α' and log h γ' are proved. The verifying mechanism verifies the equality of a log α α' and log β β' and the equality of log g α' and loq h γ'. Then, the received β' and γ' are checked to determine the equality or inequality thereof, and it is determined whether the proof is acceptable, depending on the verification and the check results.
摘要翻译：零知识证明系统包括用于证明两个离散对数的相等或不等式的证明机制和用于验证所述相等或不等式的验证机制。证明机制存储包括指定操作方案，两个输入数字α和β以及两个预定基数g和h的公共信息，作为对基g的α的离散对数的私人信息x。转换α，β和h后，产生α'，β'和γ'如下：α'=αr; beta'= beta ; 和gamma'= h ，证明了对数αα'和logββ'的相等以及loggα'和logγγ'的相等性。验证机制验证log alpha alpha'和log beta beta'的等式和logg alpha'和loqh gamma'的相等度。然后，检查接收的beta'和gamma'以确定其等同性或不等式，并且根据验证和检查结果确定证明是否可接受。

5. 发明公开

EP1251422A2 Copyright protection system and method thereof 审中-公开
标题翻译： Urheberrechtsschutzsystem und Verfahrenhierfür
公开(公告)号：EP1251422A2
公开(公告)日：2002-10-23
申请号：EP02008212.9
申请日：2002-04-17
申请人： NEC CORPORATION
发明人： Morishita, Takuya , Miyauchi, Hiroshi , Minematsu, Kazuhiko , Obana, Satoshi
IPC分类号： G06F1/00
CPC分类号： G06F21/10 , G06F2221/2103 , G06F2221/2107
摘要： It is characterized to comprise an authentication device 4 having invalid information of a key in relation to cryptology, and for disapproving authentication in case that information of an authentication key is included in the invalid information, which is used for authentication when a first cryptographic key in relation to encrypting is shared between a first encrypting device 3 and a first decryption section 11, and an certificate revocation list updating device 5 for updating contents of the invalid information in the authentication device 4 when receiving information of a key of an object to be invalidated, which is provided together with an input data in relation to a work.
摘要翻译：其特征在于包括认证装置4，其具有与密码相关的密钥的无效信息，并且在认证密钥的信息被包括在用于认证的无效信息中的情况下不认证，当第一密码密钥在关于加密的关系在第一加密装置3和第一解密部11之间共享，以及证书撤销列表更新装置5，用于当接收到无效对象的密钥的信息时，更新认证装置4中的无效信息的内容，其与与作品相关的输入数据一起提供。

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