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Data encryption/decryption method and inspection system

A monitoring system and data technology, applied in analog security/charging systems, closed-circuit television systems, digital transmission systems, etc., can solve problems such as difficulty in obtaining synchronization, difficult key management, and increased cost, and achieve easy implementation and key management. Handling simple effects

Inactive Publication Date: 2006-06-21
YOKOGAWA ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0016] However, it is difficult to obtain accurate time synchronization and additionally increases the associated costs
Furthermore, when time reversal occurs simultaneously with the time change of the image distribution apparatus 10, key management cannot be performed correctly
[0017] In the case of performing key management related to sequence numbers (2), it is difficult to perform key management correctly when sequence numbers are duplicated due to some cause such as reset

Method used

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  • Data encryption/decryption method and inspection system
  • Data encryption/decryption method and inspection system
  • Data encryption/decryption method and inspection system

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Embodiment Construction

[0033] Embodiments of the present invention will now be described in detail with reference to the accompanying drawings. A data encryption / decryption method and a monitoring system will be described. In an embodiment, image data obtained by a surveillance camera is used. Figure 1 shows an embodiment of a monitoring system according to the invention.

[0034] The surveillance system shown in FIG. 1 has an image distribution device 110 including an image distribution unit 111 such as a surveillance camera, an image reproduction device 130 , and a key management device 140 . In this embodiment, the image distribution device 110 distributes encrypted image data to the image reproduction device 130 via the network 120 . Therefore, it is not necessary to secure the communication path with IPsec or SSL in order to secure the image data.

[0035] On the other hand, key information is transmitted in directions indicated by dotted arrows via the network 120a between the key managemen...

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Abstract

Disclosed is a monitoring system having: a distribution device that encrypts continuous data and distributes the encrypted continuous data via a network; a reproduction device that decrypts the encrypted data distributed via the network to reproduce the continuous data; and key management An apparatus having a key management database. The distribution device obtains the key number associated with the distribution device and key information associated with the key number from the key management device, encrypts data using the obtained key information, and distributes the Encrypt data. The regeneration device transmits the key number attached to the encrypted data to the key management device, obtains key information associated with the transmitted key number, and decrypts the encrypted data using the obtained key information.

Description

[0001] This application is based on and claims priority from Japanese Priority Patent Application No. 2004-360821 filed on December 14, 2004, the entire contents of which are incorporated herein by reference. technical field [0002] The invention relates to a data encryption / decryption method and a monitoring system. In particular, the present invention relates to an improvement of a key management method in a system in which a device for distributing continuous data such as moving pictures is different from a key management device that manages The encryption and decryption keys thus provide security for this continuous data. [0003] In order to realize the security of continuous data, it is necessary to change the key for encrypting and decrypting data according to appropriate timing. Background technique [0004] There is a system as a prior art in which an image distribution device having a plurality of image distribution units such as surveillance cameras located in a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/16H04L9/08H04N7/18
CPCH04L9/083H04L2209/60
Inventor 伊藤和幸宫泽和纪
Owner YOKOGAWA ELECTRIC CORP
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