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A security service is a collection of mechanisms, procedures, and other controls that are implemented to help reduce the risk associated with the threat of data loss or compromise. Some services provide protection from threats, and other services provide for detection of the occurrences of any breach. For example, an identification and authentication service helps reduce the risk posed by access to the system by an unauthorized user. An example of a service that detects a security breach is a logging or monitoring service. The following security services are discussed in this section:
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Authentication is the security service that can be used to ensure that individuals accessing the network are authorized. Confidentiality is the security service that can be used to ensure that data, software, and messages are not disclosed to unauthorized parties. Integrity is the security service that can be used to ensure that unauthorized parties do not modify data, software, and messages. Nonrepudiation is the security service that can be used to ensure that the entities involved in a communication cannot deny having participated in it. Specifically, the sending entity cannot deny having sent a message (nonrepudiation with proof of origin), and the receiving entity cannot deny having received a message (nonrepudiation with proof of delivery).
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Though not discussed in this chapter, access control is the security service that helps ensure that network resources are being used in an authorized manner.
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The first step in securing system resources is to implement a service to verify the identities of users, a process referred to as authentication. Authentication provides the foundation that determines the effectiveness
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of other controls used on the network. For example, a logging mechanism provides usage information based on user ID, and an access-control mechanism permits access to network resources based on the user ID. Both controls are effective only under the assumption that the requester of a network service is the valid user assigned to that specific user ID. Identification requires that the user be known by the system or network in some manner, usually based on an assigned user ID. However, unless the user is authenticated, the system or network cannot trust the validity of the user s claim of identity. The use is authenticated by supplying something possessed only by the user (such as a token), something only the user knows (such as a password), or something that makes the user unique (such as a fingerprint). The more of these kinds of authentication that the user must supply, the less risk there is that someone can masquerade as the legitimate user. On most systems and networks, the identification and authentication mechanism is a scheme that combines a user ID with a password. Password systems can be effective if managed properly, but they seldom are managed properly. Authentication that relies solely on passwords often fails to provide adequate protection for systems for a number of reasons. First, users tend to create passwords that are easy to remember and hence easy to guess. On the other hand, passwords generated from random characters are difficult to guess but also difficult for users to remember. As a result, users may write down such passwords, and they are often found in areas that are easy accessible. It s not unusual, for example, to find passwords written on sticky notes mounted on computer monitors, where anyone can find them and use them to gain access to the network. The guessing of passwords is a science, and a great deal of research has been published that details the ease with which passwords can be guessed. Proper password selection striking a balance between the password being easy to remember for the user but difficult to guess for everyone elsehas always been an issue. Password generators have been developed that produce passwords consisting of pronounceable syllables. Such passwords have greater potential of being remembered than those made of purely random characters. Some systems and network administrators require the use of an algorithm that produces random pronounceable passwords. Programs called password checkers enable a user to determine whether a new password is considered easy to guess and thus unacceptable. Because of the vulnerabilities that still exist with the use of passwordonly mechanisms, more robust mechanisms can be used, such as tokenbased authentication or biometrics. A smart card based or token-based
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