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3. Identify and protect communication channels. Communication channels include all protocols, hardware devices, communication lines (dedicated and public) and computer network segments over which data will be traveling should be identified. Both the type of data as well as its security requirements will determine (or, at least, strongly effect) the type of communication channel necessary or available. For example, many payment transactions are still sent over value added networks (VANs) using X.400 messaging. Conversely, many modern applications communicate across a public TCP/IP network using a combination of HTTP, HTTPS protocols and HTML, XML or a proprietary message format. Other influencing factors of the type of communication channel include the available technology of the partner organization, industry conventions and budget. For traffic separation, dedicated communication channels are preferred, because they reduce the risk of harmful (malicious or inadvertent) events originating from one partner and affecting others, as well as eliminating single points of failure across multiple users. When possible, isolate partner traffic either physically or logically. Physical separation is achieved by using dedicated hardware (servers, firewalls, communication lines) and software. Logical separation is achieved through segmented IP addressing, virtual environments such as multiple operating systems on a mainframe, virtual Web hosts, and multiple databases on a shared installation. For each of these communication channels, identify and protect the SINGLE ACCESS POINT (279)s into the enterprise and its systems. Relevant questions to ask are: do additional ports need to be opened up at the firewall or edge routing device, and how will this affect the overall security posture of the environment Does the network or application need to be modified to allow access for a particular set of users or hosts and will this result in additional threats or

That last point is particularly important. There is no reason, for instance, that a Simple Moving Average cannot be applied to the Volume pane as easily as it could be applied to the Price pane. The exibility in ProphetCharts provides a virtually unlimited palette for crafting technical studies to help you make better trading decisions.

vulnerabilities Will physical access be required by the partner to the enterprise office (or its affiliates) Will any special arrangements be necessary to support the partner, such as segregated network connectivity (VPN), analogue phone lines, and so on. How will enterprise systems be protected while external partners are on the premises Access controls must be applied at any point at which data is passing from one system (user, hardware device, application) to another. Types of access controls include the following:

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Technical access controls used at the network (transmission) layer in routers, firewalls and servers to prevent access from unauthorized hosts. These can be used at the application layer as well, to grant and deny access to specific users. Administrative access controls used to define policies and procedures that govern the acceptable circumstances and conditions under which the data can be accessed. Physical access controls used to ensure physical protection of the data. For example mechanical door locks to offices, server rooms, and cabinets.

For all implementations of access control, employ a failed closed policy by preventing all access, then granting access for specific entities. This is most commonly used on network perimeter devices such as firewalls, routers and internet servers. User authorization should be enabled according to the principles of Least Privileges and Separation of Duties [Sal75] and by applying ROLE-BASED ACCESS CONTROL (249). Least Privileges is also known as Need to Know, and is discussed in Security Principles and Security Patterns on page 504). Least Privileges ensures that a particular subject (human or application user) only has the necessary privileges required to perform a given task. An example would be to grant access to write or modify files in a repository, but not delete files. ROLE BASED ACCESS CONTROL is used to assign a subject (user) to one or many roles, with each role allotted a unique collection of privileges. This abstracts the subject from their privileges, providing a business-centric approach and improving the management of access control. The roles of system administrator, sales advisor and purchaser, for example, would all have unique collections of privileges in a corporate directory. Finally, Separation of Duties distributes responsibility (trust) across multiple subjects and is often used in conjunction with ROLEBASED ACCESS CONTROL (249). For example, partitioning roles (and therefore privileges) of a bank customer with teller and auditor. 4. Define exchange methods and procedures. Any form of data exchange will require special pre- or post-processing, depending both on the method of exchange and on any requirements to comply with

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