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Security Issues in Multimedia [Tele]Conferencing

Many organizations are outsourcing the deployment and maintenance of their World Wide Web site to hosting providers that provide security, backup, reporting, administration, and monitoring capabilities. Many of these providers offer service level agreements that guarantee fewer than five hours of unplanned downtime per year. A multilayer server array architecture can be used in the site arrangement that is being outsourced. Such a site might consist of front-end, application, and database servers and it might include a firewall. Typically, however, such a site would have no diversity or redundancy. Each node would have a single point of failure. Again, typically, T-1 leased telecommunication lines would be used to connect the different sites to the external hosting site. The provider’s managed hosting operation would function as a configuration manager and a monitoring mechanism. The provider and the Web site owner collaborate in software fix and patch distribution and application asset and configuration inventory supervision real-time security and performance monitoring remote network surveillance and administration Particular attention is given by both parties to avert problems with access blocking. The goals are to avoid obstructing connectivity to the site. Accomplishing this calls for intense real-time monitoring of platform component operation, especially in a situation in which the Web site is engaged in an electronic commerce application. In turn, this monitoring is supported by a real-time transaction and performance reporting activity. A Web site hosting provider can furnish one or more types of services. These include: Shared — in which the Web site hardware and telecommunication bandwidth are apportioned among some of the provider’s customers. Collocated — in which the customer owns the Web site hardware, software, and network equipment, which is housed at the provider’s location. The Web site owner is responsible for the installing, managing, and security of the Web site. Dedicated — in which the service provider supplies the Web site hardware, software, and network equipment, and the support that is associated with it at the customer’s location. Customized — in which the service provider designs, installs and operates a Web site to conform to the customer’s specific requirements. (These requirements can be generalized in nature or may be focused, for example, on customer service, procurement, or sales staff management. In this sort of arrangement the hosting service provider takes complete responsibility for the technical administration of the Web site and the customer is responsible just for its content.) The major issues in implementing a crossplatform Web site hosting arrangement revolve around connectivity. These are generated by the demands of file sharing and database access efficiency. In particular, the Web site hosting provider needs to understand the complex interaction of the different routers and other hardware, and the dissimilar operating systems, database architectures, and programming languages that are being employed by the customers. All of them must cooperate and both the Web service provider and the Web site owner must be able to monitor this activity in realtime.