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CompTIA Security+ All-in-One Exam Guide
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The SANS Institute offers several examples of password policies (along with many other common information security policies) available on its web site (wwwsansorg)
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A domain password policy is a password policy for a specific domain As these policies are usually associated with the Windows operating system (see Figure 19-4), a domain password policy is implemented and enforced on the domain controller The domain password policy usually falls under a group policy object and has the following elements: Enforce password history Tells the system how many passwords to remember and does not allow a user to reuse an old password Maximum password age Specifies the number of days a password may be used before it must be changed Minimum password age Specifies the number of days a password must be used before it can be changed again Minimum password length Specifies the minimum number of characters that must be used in a password Password must meet complexity requirements Specifies that the password must meet the minimum length requirement and have characters from at least three of the following four groups: English uppercase characters (A through Z), English lowercase characters (a through z), Numerals (0 through 9), and nonalphabetic characters (such as !, $, #, %) Store passwords using reversible encryption Essentially the same as storing a plaintext version of the password; should be used only when applications use
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Figure 19-4 Password policy options in Windows Local Security Settings
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19: Privilege Management
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protocols that require the user s password for authentication (such as ChallengeHandshake Authentication Protocol, or CHAP)
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To use a system, users must be able to access it, which they usually do by supplying their user IDs and corresponding passwords As any security administrator knows, the more systems a particular user has access to, the more passwords that user must have and remember The natural tendency for users is to select passwords that are easy to remember, or even the same password for use on the multiple systems they access Invariably, users will forget the passwords they chose for infrequently accessed systems, which creates more work for system administrators who must assist users with password changes or password recovery efforts Wouldn t it be easier for the user simply to log in once and have to remember only a single, good password This is made possible with a technology called single sign-on Single sign-on (SSO) is an authentication process in which the user can enter a single user ID and password and then be able to move from application to application or resource to resource without having to supply further authentication information Put simply, you supply the right user ID and password once and you have access to all the applications and data you need, without having to log in multiple times and remember many different passwords From a user standpoint, SSO means you need to remember only one user ID and one password From an administration standpoint, SSO can be easier to manage and maintain From a security standpoint, SSO can be even more secure, as users who need to remember only one password are less likely to choose something too simple or something so complex they need to write it down Figure 19-5 shows a logical depiction of the SSO process: 1 The user signs in once, providing a user ID and password to the SSO server 2 The SSO server then provides authentication information to any resource the user accesses during that session The server interfaces with the other applications and systems the user does not need to log in to each system individually
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PART V
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Figure 19-5 Single sign-on process
CompTIA Security+ All-in-One Exam Guide
In reality, SSO is usually a little more difficult to implement than vendors would lead you to believe To be effective and useful, all your applications need to be able to access and use the authentication provided by the SSO process The more diverse your network, the less likely this is to be the case If your network, like most, contains multiple operating systems, custom applications, and a diverse user base, SSO may not even be a viable option EXAM TIP The Security+ certification exams will very likely contain questions regarding single sign-on because it is such a prevalent topic and a very common approach to multisystem authentication
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