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  • Cloud computing architecture the HD network monitoring application analysis

        The rise of cloud security, the development of security video surveillance to create a new turning point, so the massive video storage, high density data center become possible, however, how the cloud architecture definition network video surveillance data management?
        The main driving force of the development of the architecture of the network video surveillance video surveillance to the cloud-based cloud computing technology can bring the convenience of the user application, the incalculable computing power and massive storage capacity, as well as cloud computing technology can greatly reduce the network´s high-definition video monitor during deployment costs, including administrative costs, maintenance costs and operating costs and reliability of the system. These are past the bottleneck of traditional analog video surveillance and the rapid development of the network´s high-definition video monitor in the development process.
        HD network video surveillance has been the development in recent years, has become the mainstream of the development direction of the video surveillance, network architecture evolution to the client and the central server, in fact, this architecture and cloud computing distributed architecture is very similar to whole more distributed network architecture design, multiple local monitoring network interconnection grid architecture. All Internetworking IP-based way, and other standardization organizations such as ONVIF, PSIA and the latest national standard GB28181 such as network interconnection standards defined, and extensive support. In fact, the clearer and more open network interface definition HD video surveillance to achieve the management of multi-vendor equipment for cloud computing architecture evolution provides good conditions. Although the wave of cloud computing is leading the development direction of network video surveillance, and to meet the demand for HD video surveillance in the mass storage, intelligent analysis and calculation ability, but the developers and interface open standard network architecture inherent network reliability and stability of the system as well as data security concerns.
        Cloud computing network under the framework program of high-definition video surveillance applications select
        Cloud computing architecture system security considerations, as well as demand for cloud video services (VideoSAAS) immature, based on a cloud-based network video surveillance system technology, products and solutions to achieve more complex, and therefore this evolution The process should be gradual, and only in some special industry applications deploy video surveillance networks, cloud-based computing architecture, the other in the city-building programs of national wisdom among them.
        The hardware virtualization First become a network of high-definition video applications and the first step in the development of the cloud computing architecture. Hardware virtualization has changed the traditional relationship of software and hardware, the use of the software is no longer limited to the hardware, and applications such as the stored software can run on hardware in several places, and not limited to a DVR or NVR The hard drive inside. The hardware virtualization greatly increased the efficiency of the utilization of resources, while reducing the investment and maintenance costs. Hardware virtualization for cloud services (IaaS, Infrastructure as a Service) has laid a good foundation, on top of this framework for private cloud and public cloud services.
        In fact, within the field of security applications of cloud computing the mainly private cloud, especially in the cloud storage and reduce maintenance costs, and improve system reliability. Cloud storage can be stored completely virtual, greatly simplify application remission, customers save construction costs, while providing more storage and sharing capabilities. Security monitoring technology development today has gone through three stages: analog, digital, network-based. Corresponding adaptation, monitoring, data storage also experienced several phases: the the VCR analog data store, DVR digital data storage, the now centralized network storage, as well as the recent emergence of cloud storage technology. Should be the development of the industry needs: SAN storage technology to the rapid popularization and application. Today, VCR has basically been completely replaced DVR storage price is cheap, mature technology, easy to use, but due to poor reliability and shared widely used in small-scale, distributed systems. With the expansion of the scale of monitoring, expanded storage mode in DVR mode, the encoder plug storage devices, major mining SATA, USB, SCSI storage protocol extensions for deployment in small and medium-sized, surveillance video data through RAID technology some assurance on the reliability. However, the model is generally directly connected, can not be shared and low capacity expansion, not suitable for large-scale data storage. Cloud storage will achieve future higher-resolution video surveillance storage needs, will be a very innovative application of technology.
        In addition, a private video surveillance cloud can also provide better system reliability, performance, and lower maintenance costs. The user no longer concerned with the calculation of the storage devices and storage space, no longer the relationship between the configuration of network equipment and learn the intricacies of network knowledge. Of course, private video surveillance cloud scale limited mainly to be used within the enterprise, especially on the branches of a large number of enterprises. Need to consider the deployment of such a large-scale network like smart city public cloud, public cloud cloud operations should also be considered in addition to the expansion of private cloud storage, computing power, is how the user billing problems, there is a very important is the public cloud is how to ensure that the user data security issues.
        Cloud computing architecture network video surveillance data security
        Open cloud technology has also brought a new threat, and that is the security of the video data. Security video surveillance only keywords, and how to protect the security of the network´s high-definition video data during video capture, transmission, decoding, playback, video, security access and use, to avoid IP-based malicious access and virus attacks, malicious control, malicious tampering, videos, etc., caused by the thinking of some manufacturers.
        First from network attacks, network attacks are not new in the area of ​​IT or communications, but the size of the network technology in the field of video surveillance applications inevitably facing similar problems: trojans, viruses, denial of service attacks, and hacker attacks. Secondly, from malicious access to the network. Currently circulating on the network address of the IP camera through Google GOOGLE search by simple processing can capture, the IP camera installed in all over the world, and you can adjust the angle of the camera, PTZ Control. Even a company specializing in global IP video camera live online video services provide special needs. From hackers is no longer a vision of the director in American movies, and the real in the event the hacking network camera is no longer sensational news. Recently, there have been such cases: The criminals intercepted surveillance camera video data, and for fake video data to replace the monitoring information, criminals surveillance camera before brazenly stealing, vividly staged an incredible scene in the gangster film. All unencrypted video data is malicious access and malicious tampering. The video can be obtained through some means to carry out the purpose of tampering, which makes video surveillance video there are risks as reliable evidence.
        In general, an attacker can mainly be divided into two aspects, the first aspect of the attack of the data transmission process, such as data transmission process, interception, or insert the modified data or video data transmission backup; addition On the one hand is to infiltrate the image acquisition, storage or video equipment to steal confidential information of the video, and then processed, tampered with or even destroy data.
        Effectively analyze possible ways of attacks on network video surveillance taken great significance for us to deploy a more effective security IP camera monitoring program. First, take a more safe and reliable user comprehensive authentication technology, to ensure the safety of equipment. More closely divided on the user´s permission, the various functions to hide or show all based on the type of user. The average user does not control permissions administrator user must have the appropriate key equipment to be able to log. Secondly, at the network layer and the transport layer, using the IPSec encryption, SIP session-based protocol for device communication using TLS article security encryption SIP message, the transmission process using RSA (1024, 2048 optional) the session key transfer content using DES, 3DES, AES encryption algorithm to encrypt.
        In addition, the use of encryption and decryption of the image is implemented in the front-end image capture device such as a camcorder, backend storage decrypt and display equipment, such as the NVR, the DVR and VMS software through national encrypted Board Certified encryption algorithm hardware encryption chip. Worthy of note is, this is an entirely hardware encryption and decryption, and substantially impossible to be achieved by any means cracks. Security decryption card must provide users with the same side supporting a key to decrypt function. Only confidential card and key users can achieve access to the IP network camera, video preview, playback, video search, device management, user configuration operation.
        More worthy of note is that the encrypted video data can be flexibly configured according to the needs of users in order to achieve different reality.
        Video cloud storage data management
        HD video surveillance in the main problem is how to deal with a large high-definition video data. If 1080P HD video surveillance, access to the highest compression ratio of H.264 image compression technology deal with collection of HD video, compressed output bit rate can reach up to 6Mbps, each camera will produce about 50GB so daily the amount of data storage, processing, this pressure is enormous.
        With monitoring cloud storage services provided by the manufacturer, is expected to get rid of the huge investment in hardware storage devices, reduce manpower expenditure on system maintenance, quickly alleviate the financial pressure to enhance the competitiveness of enterprises. By then, users only need to pay a small amount of storage cost, large capacity data can exist cloud, and based on the need to set permissions, sharing anytime, anywhere to the need to share personnel, while reducing data transmission time, with manufacturers more excellent encryption technology, to avoid the generation of packet loss, leaks and other accidents caused in the transmission process, to guarantee the security of the data.
        Video Data Manager
        Scalable NAS platform with a lot of choices, but generally speaking, they showed a service, a hardware device or a software solution, every option has its own advantages and disadvantages:
        Service mode: the most general case, when you consider cloud storage, you will think of the products of the services they provide. This mode is very easy to start, its scalability is almost instantaneous. By definition, you have an off-site data backup. However, the bandwidth is limited, therefore you have to consider the recovery model. You must meet the needs of the data outside your network.
        The HW mode: This deployment is located behind a firewall, and its throughput than the public´s internal network. Very convenient purchase integrated hardware storage solutions, manufacturers in installation / management do good is often accompanied by a rack and stack model. However, you will give up some of Moore´s Law, the advantage, because you will be subject to the limitations of the hardware.
        SW Mode: SW model has the advantages of HW mode. In addition, it has the advantage of the HW are no price competition. However, the installation / management program to be cautious concern, install some SW is indeed very difficult, or other conditions may need to restrict people choose HW, choose SW.
        Based on a distributed architecture, can be used to cluster in the form of a common external services provided to the massive pressure of real-time video data uniformly dispersed to each processing node to achieve load balancing to ensure that each node in the efficient operation of state. Based on the real-time requirements, you can take the data access, processing, forwarding modules optimized as far as possible data not migrate in the cluster, reduce IO and transmission operations, to further ensure the real-time requirements.
        Network video surveillance in the framework of cloud computing data transmission network bandwidth requirements to achieve network flexibility and expansion, the other in the framework of this network, and to improve the technical performance, you need to monitor demand instantaneous user client dynamically Adjust the video resolution.
        In addition, agreement for the acquisition of high-definition video camera signal format due to the different business needs of various manufacturers are not the same, you need to complete real-time transcoding in the cloud computing platform, collected by the brightest high-definition video signal is converted to comply with monitoring The signal of the needs of the client, and real-time forwarding, so you can effectively reduce the decoding end pressure monitoring, making monitoring more fluid and can effectively support the monitoring requirements, such as mobile phones and other mobile terminals. Through a series of data management technology can solve the problems faced by the technology in the face of the Network HD video surveillance data storage, processing, and applications of cloud computing. Of course, with the advent of the new business needs, cloud storage, cloud computing technology of processing data is also rapidly changing, which requires that the manufacturers must keep track of such changes, and be able to maintain continued investment in technology and product and innovation.
        According to the former description, we can clearly recognize the high-definition network video surveillance system in the process of development in the direction of the cloud computing architecture, network architecture, open standards, business management, and customer demand, etc. already has a mature conditions such as mature technologies, products and solutions, but cloud security real actual project construction, realization of cloud to rain, you need to consider the point of integration in the cloud computing technology and video surveillance business needs, mainly reflected in the data storage data security and data management problems.

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