Cloud computing is an emerging application model. It integrates traditional application computing resources into a cloud service center with larger capacity and faster speed. Cloud computing is based on virtualization technology, using the network as the carrier, providing services such as infrastructure (IaaS), platform (PaaS), software (SaaS), and integrating large-scale and scalable computing, storage, data, and application distribution Supercomputing mode in which computing resources work together. The application of cloud computing can be expanded and contracted, enabling users to obtain resources suitable for their own needs, greatly saving users' computing costs while improving computing efficiency.
In the cloud computing environment, the user's concept of use will also undergo a radical change: from "buying products" to "buying services", because they will no longer directly face complex hardware and software, but the final service . Users do not need to have visible and tangible hardware facilities, nor do they need to pay for equipment power supply, air conditioning and refrigeration, maintenance and other expenses for the computer room, and do not need to wait for a long supply cycle, project implementation and other lengthy time. Need to remit funds to cloud computing service providers, you can get the services you need right away.
Although cloud computing has greatly reduced users' own application costs, the computing model based on virtualization and remote network makes its security questioned. Among many users, especially commercial users, privacy protection is one of their focus issues. They are unwilling to let the government know their commercial behavior, nor do they want their opponents to know any relevant trade secrets. The same is true for ordinary users. Private photos and information are stored in the cloud, and they are most worried about information leakage. At the same time, the remote identity authentication mechanism is relatively fragile and cannot guarantee the security of user identity. From the perspective of current cloud computing promotion, the following issues restrict the promotion and development of cloud computing:
Data privacy issues. How to ensure that the privacy of the data stored in the cloud service provider is not illegally used requires not only technical improvements, but also further legal improvements.
Data security. Some data are business secrets of the enterprise. The security of data is related to the survival and development of the enterprise. If the security of cloud computing data cannot be solved, it will affect the application of cloud computing in the enterprise.
User habits. How to change users' habits and adapt users to networked software and hardware applications is a long-term and arduous challenge.
Network transmission problem. Cloud computing services rely on the network, low speed and unstable network environment will make the performance of cloud applications not high, the popularization of cloud computing depends on the development of network technology.
Careful analysis of the security issues faced by cloud computing, in fact, is not much different from traditional security issues, but there have been great changes in security solutions and service models. Here is an example of private cloud built by enterprises. Second, with the gradual promotion of cloud computing applications, some large group companies have begun to initially use private clouds, integrating IT resources, providing various services for enterprises, and centrally configuring employee application resources , Management, and computing resource sharing, greatly reducing the operation and maintenance management of traditional employees on a single computer, and strengthening the management and control of employees. In order to solve the security problems of cloud platform user access and data storage, digital certificates are used to achieve strong identity authentication for accessing users and encryption of private data.
At present, most private clouds are designed based on virtualization architecture. The virtual infrastructure is to strip the traditional user PC-side local computing, applications and storage to the data center, and perform all operations through independent virtual machines deployed in server clusters. And processing, the client only does the presentation of the calculation results and the entry of calculation information. This architecture solves the problems of insecurity and difficult management caused by local data calculation and storage in the traditional model with PC as the client.
Under the virtual application architecture, the user's resources can be flexibly expanded, and different operating systems and personalized data are used as needed. At the same time, the cloud access gateway is used in the access link to respond to the user's access request, and the digital certificate is used to achieve Strong authentication of user identity, users must show a digital certificate to log in to the virtualized remote desktop before they can enter the virtual environment. In the background of the cloud environment, there are special security devices to provide encryption services. The scheduling and management of encryption keys are realized through the cloud platform management system, the business or personal data that needs to be encrypted are encrypted, and the encryption keys are encrypted through personal users' digital certificates. Encryption ensures that only the encryptor can open the encrypted data, ensuring the privacy and security of various user data.
In the cloud computing environment, identity authentication and data security are more important. The asymmetric encryption feature of digital certificates can effectively solve the above problems. There is not much difference between the implementation principle and traditional certificate applications.
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