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1. 发明授权

EP2003812B1 Method and device for managing cryptographic keys in secret communications network 有权
公开(公告)号：EP2003812B1
公开(公告)日：2020-07-22
申请号：EP08158071.4
申请日：2008-06-11
申请人： NEC Corporation
发明人： Maeda, Wakako , Tajima, Akio , Tanaka, Akihiro , Takahashi, Seigo
IPC分类号： H04L9/08

2. 发明公开

EP1742409A1 Communication system and method for controlling the same 审中-公开
标题翻译：公民制和德法国人
公开(公告)号：EP1742409A1
公开(公告)日：2007-01-10
申请号：EP06014178.5
申请日：2006-07-07
申请人： NEC Corporation
发明人： Tanaka, Akihiro , Tajima, Akio , Takahashi, Seigo , Maeda, Wakako
IPC分类号： H04L9/08 , G06F11/00
CPC分类号： H04L1/242 , H04L9/0858 , H04L2209/34
摘要： An efficient and stable communication system and a system control method are provided which enable efficient and stable operation. In said system and method at least one item to monitor (monitored item) and a fault-detection threshold for each monitored item are previously set. Based on such monitored item and its fault-detection threshold, a fault is identified, and then appropriate recovery is performed depending on the identified fault. The monitored item may be an error rate, a change rate of the error rate, a shared data generation rate, or the like. In the communication system
a first communication device communicates with a second communication device through a transmission line and includes: setting at least one fault-detection threshold for each monitored item; comparing a measured value for each monitored item with at least one fault-detection threshold set for the monitored item, to determine whether a corresponding fault occurs; and when it is determined that the corresponding fault occurs, performing recovery of the communication system from the corresponding fault.
摘要翻译：提供了一种高效稳定的通信系统和系统控制方法，可实现高效稳定的操作。在所述系统和方法中，预先设置了至少一个监视项目（监视项目）和每个被监视项目的故障检测阈值。根据这种监控项目及其故障检测阈值，识别故障，然后根据识别出的故障进行适当的恢复。所监视的项目可以是错误率，错误率的变化率，共享数据生成速率等。在通信系统中，第一通信设备通过传输线与第二通信设备通信，并且包括：为每个被监控项目设置至少一个故障检测阈值; 将每个被监视项目的测量值与为被监视项目设置的至少一个故障检测阈值进行比较，以确定是否发生相应的故障; 并且当确定相应的故障发生时，从相应的故障执行通信系统的恢复。

3. 发明授权

EP1708364B1 Photo detecting circuit and noise elimination method 有权
标题翻译：光电检测电路和噪声消除方法
公开(公告)号：EP1708364B1
公开(公告)日：2017-11-22
申请号：EP06006588.5
申请日：2006-03-29
申请人： NEC Corporation
发明人： Takahashi, Seigo , Tajima, Akio , Takeuchi, Takeshi , Tanaka, Akihiro , Maeda, Wakako
IPC分类号： H03F1/26
CPC分类号： H03F1/26 , H03F3/087 , H03F2200/198
摘要： In a photo detecting circuit using an avalanche photodiode (APD), a pulse noise mask signal indicating the timing of occurrence of a pulse noise is generated by XORing a reverse-bias-pulse application timing signal and its delayed signal. Pulse noises are eliminated by ANDing an output signal of the APD and the pulse noise mask signal. Alternatively, a pulse noise is estimated by taking the average for the output current signal a given number of times. Pulse noises are eliminated by subtracting the estimated pulse noise from the APD output signal (Fig. 1).

4. 发明公开

EP1848142A2 Secret communications system and channel control method 有权
标题翻译：系统地球物理学与科学与工程学院
公开(公告)号：EP1848142A2
公开(公告)日：2007-10-24
申请号：EP07007732.6
申请日：2007-04-16
申请人： NEC CORPORATION
发明人： Tajima, Akio , Tanaka, Akihiro , Maeda, Wakako , Takahashi, Seigo
IPC分类号： H04L9/08
CPC分类号： H04L9/0852 , H04L9/0855
摘要： A secret communications system realizes point-to-multipoint or multipoint-to-multipoint connections of both quantum channels and classical channels. Multiple remote nodes are individually connected to a center node through optical fiber, and random-number strings K1 to KN are individually generated and shared between the respective remote nodes and the center node. Encrypted communication is performed between each remote node and the center node by using the corresponding one of the shared random-number strings K1 to KN as a cryptographic key. The center node is provided with a switch section for quantum channels and a switch section for classical channels. Switching control on each of these switch sections is performed independently of the other by a controller.
摘要翻译：秘密通信系统实现了量子通道和经典通道的点对多点或多点到多点连接。多个远程节点通过光纤单独连接到中心节点，并且在各个远程节点和中心节点之间分别生成并共享随机数字串K1至KN。通过使用共享随机数字符串K1至KN中的相应一个作为加密密钥，在每个远程节点和中心节点之间执行加密通信。中心节点设置有用于量子通道的开关部分和经典通道的开关部分。这些开关部分中的每一个的开关控制通过控制器独立地执行。

5. 发明授权

EP1848142B1 Secret communications system and channel control method 有权
公开(公告)号：EP1848142B1
公开(公告)日：2018-07-25
申请号：EP07007732.6
申请日：2007-04-16
申请人： NEC Corporation
发明人： Tajima, Akio , Tanaka, Akihiro , Maeda, Wakako , Takahashi, Seigo
IPC分类号： H04L9/08
CPC分类号： H04L9/0852 , H04L9/0855
摘要： A secret communications system realizes point-to-multipoint or multipoint-to-multipoint connections of both quantum channels and classical channels. Multiple remote nodes are individually connected to a center node through optical fiber, and random-number strings K1 to KN are individually generated and shared between the respective remote nodes and the center node. Encrypted communication is performed between each remote node and the center node by using the corresponding one of the shared random-number strings K1 to KN as a cryptographic key. The center node is provided with a switch section for quantum channels and a switch section for classical channels. Switching control on each of these switch sections is performed independently of the other by a controller.

6. 发明授权

EP1808761B1 Circuit and method for controlling quality of random numbers 有权
标题翻译：电路和方法，用于控制随机数的质量
公开(公告)号：EP1808761B1
公开(公告)日：2013-12-04
申请号：EP07100257.0
申请日：2007-01-09
申请人： NEC Corporation
发明人： Tanaka, Akihiro , Tajima, Akio , Takahashi, Seigo , Maeda, Wakako
IPC分类号： G06F7/58 , H04L9/08
CPC分类号： H04L9/0852 , G06F7/58 , H04L9/0838

7. 发明授权

EP1848128B1 Optical communication device and quantum key distribution system using the same 有权
标题翻译：光通信装置和量子密钥分配系统
公开(公告)号：EP1848128B1
公开(公告)日：2010-10-27
申请号：EP07090078.2
申请日：2007-04-20
申请人： NEC Corporation
发明人： Tanaka, Akihiro , Tajima, Akio , Takahashi, Seigo , Maeda, Wakako
IPC分类号： H04B10/155 , H04L9/08 , H04B10/30
CPC分类号： H04B10/5051 , H04B10/505 , H04B10/54 , H04B10/548 , H04B10/70 , H04L9/0858

8. 发明公开

EP1808761A2 Circuit and method for controlling quality of random numbers 有权
标题翻译： Schaltung und Verfahren zur Kontrolle derQualitätvon Zufallszahlen
公开(公告)号：EP1808761A2
公开(公告)日：2007-07-18
申请号：EP07100257.0
申请日：2007-01-09
申请人： NEC CORPORATION
发明人： Tanaka, Akihiro , Tajima, Akio , Takahashi, Seigo , Maeda, Wakako
IPC分类号： G06F7/58
CPC分类号： H04L9/0852 , G06F7/58 , H04L9/0838
摘要： A random number quality control circuit capable of fast control of the level of random number quality is present. When a "0" output section and a "1" output section generate random numbers by individually receiving a random number signal, a random number quality monitor monitors an unbalance between the numbers of "0"s and "1"s. If a deviation from a desired ratio is found, a drive controller controls the reception characteristics of the "0" output section and "1" output section individually so that the deviation will be compensated for. The amount of information intercepted between a sender and a receiver can be reduced by maintaining the mark ratio of shared random numbers at 50%.
摘要翻译：存在能够快速控制随机数量级别的随机数质量控制电路。当“0”输出部分和“1”输出部分通过分别接收随机数信号产生随机数时，随机数质量监视器监视“0”和“1”之间的不平衡。如果发现与期望比率的偏差，则驱动控制器分别控制“0”输出部分和“1”输出部分的接收特性，以便补偿偏差。通过将共享随机数的标记比维持在50％，可以减少发送方和接收方之间所拦截的信息量。

9. 发明公开

EP1848142A3 Secret communications system and channel control method 有权
标题翻译：系统，用于保密通信和信道控制方法
公开(公告)号：EP1848142A3
公开(公告)日：2014-07-02
申请号：EP07007732.6
申请日：2007-04-16
申请人： NEC Corporation
发明人： Tajima, Akio , Tanaka, Akihiro , Maeda, Wakako , Takahashi, Seigo
IPC分类号： H04L9/08
CPC分类号： H04L9/0852 , H04L9/0855
摘要： A secret communications system realizes point-to-multipoint or multipoint-to-multipoint connections of both quantum channels and classical channels. Multiple remote nodes are individually connected to a center node through optical fiber, and random-number strings K1 to KN are individually generated and shared between the respective remote nodes and the center node. Encrypted communication is performed between each remote node and the center node by using the corresponding one of the shared random-number strings K1 to KN as a cryptographic key. The center node is provided with a switch section for quantum channels and a switch section for classical channels. Switching control on each of these switch sections is performed independently of the other by a controller.

10. 发明授权

EP1633076B1 Multiplexing communication system and crosstalk elimination method 有权
标题翻译：为Multiplexerkanälen之间的串扰的抑制复用通信系统和方法
公开(公告)号：EP1633076B1
公开(公告)日：2010-08-18
申请号：EP05255358.3
申请日：2005-09-01
申请人： NEC CORPORATION
发明人： Maeda, Wakako , Tajima, Akio , Tanaka, Akihiro
IPC分类号： H04L9/08
CPC分类号： H04B10/70

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