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Encoder QR in C# Lesson 2

Lesson 2
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Designing Secure Administration Practices
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domain credentials of a domain service account, and then the credentials could be used to penetrate and compromise other domain computers. The reasons for this type of local Administrator group membership practice are many, and most reasons have no basis in fact or can be eliminated by using other techniques. You will have to investigate these reasons, but you can reduce, if not eliminate, this practice and make your network more secure. 6. Determine who can manage groups and accounts with administrative access. Pro viding administrative privileges should be carefully considered so that those given power to reset passwords or otherwise manage accounts can manage only specific types of accounts. Help Desk operators, for example, should not be able to manage the accounts of Domain administrators.
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How to Protect Administrative Systems
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Administrative systems are computer systems that are used by administrators to admin ister other computers. Typically, administrative systems are domain member Windows XP or Windows 2000 computers, but they can also be Personal Digital Assistants (PDAs), Windows Server 2003 computers, or other devices on the network. The steps to secure Windows administrative systems go beyond the hardening efforts that should be applied to all computers on the network. To protect Windows administrative systems: 1. Develop a security template that is specific for the computer role. Include items that are developed for highly secure desktop computer roles. 2. Provide physical security. Administrative systems should exist in limited access areas. Only approved administrators should be able to access these areas. Systems should be locked to prevent their removal from the area. Remove floppy and CD-Rom drives to prevent possible disk-based attacks. If other physical security is good, you might decide that this step is unnecessary. As for all guidelines, you must evaluate the potential threats and your organization s risk tolerance. 3. Provide smart card logon for these systems. Smart card logon is a good security practice for the entire network. However, providing smart card logon is a large undertaking that requires additional expense. Providing smart cards for IT admin istrators and hardware for their administrative stations requires less work to imple ment and provides a lot of security for the investment. An additional benefit is that you can, to some extent, also prevent administrators from using systems other than their workstations for administration. This is possi ble because you can require that their accounts use a smart card, and not all com puters will have the necessary hardware to provide smart card access. Be aware that this is not an insurmountable impediment adding a single smart card reader that can plug into a universal serial bus (USB) port or serial port can be done rel atively cheaply.
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4
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Designing Security for Network Management
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4. Use IP security protocol filters to restrict the ingress and egress of packet types. Using protocol filters provides protection for attacks that might use known ports. It can also prevent a compromised system from attacking other uncompromised systems on the network.
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Guidelines for Protecting PDAs Used for Administration
PDAs can be used to administer Windows Server 2003 via a connection to terminal ser vices. Unfortunately, there is no way to administer a PDA that is comparable to the steps that can be taken for administering via Windows desktop systems. PDAs cannot join the domain, for example, and therefore cannot be controlled via Group Policy. There are, however, things that can and should be done to secure this form of admin istration. Follow these guidelines for protecting PDAs used for administration:
At a minimum, use the power-on password provided by the PDA. This password facility is not turned on by default, and studies show that few people turn it on. Although password protecting the PDA provides only weak security, it is far better than having no password protection at all. If sensitive information, such as a listing of accounts and passwords, is stored on the PDA, the power-on password might delay the attacker long enough to change passwords that could be exposed if the device is stolen. Consider other products that extend authentication, including RSA tokens, biometrics, and other devices. Some of these, if authentication fails, will destroy all data on the PDA and return it to factory condition.
Note Some models of the Hewlett Packard Pocket PC provide a built-in fingerprint scanner that can be used for authentication. Once enabled, if an attempt at authentication fails, the PDA is returned to factory condition. That is, all software is refreshed on the system, but any personalization and data is destroyed.
Use an encryption product. Many types of encryption products are available; some extend their charter by requiring validated logon within a short period of time. When the time period expires, the entire database on the PDA is destroyed. Label the PDA. Subscribe to one of the services that will provide a phone number to be used if the PDA is found. This, of course, works only if the finder is honest. However, hundreds of lost PDAs are turned into the Lost and Found departments of taxicab companies and airports but are never claimed. These companies do search items for phone numbers and make the necessary calls. If, however, there is no identifying information, no one can be called.
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