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It's safe to say that in Windows 2000, security gets an overhaul Many aspects of Windows NT security are scrapped and replaced with better controls, and more open policies and procedures Kerberos Login All users are affected by the changes to login security A user will still be prompted for a username and password, but authentication of this information in the domain is done quite differently from NT 40's standard check against the Security Account Manager (SAM) In Windows 2000, Kerberos (developed at MIT) is used to communicate from the DC to the user's computer NoteKerberos borrows its name from Greek mythology The three-headed dog, Kerberos (or Cerberus), protected the entrance to the underworld, Hades
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By using an open standard, other operating systems can log into a Windows 2000 domain In theory, Apple, Novell, UNIX, and anyone using Kerberos version 5 can authenticate to a Windows 2000 domain (see Figure 1-4)
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Figure 1-4: User authentication in Windows 2000 Other clients, too, can log in using various protocols For Windows NT 40 clients, the Windows DC still accepts NT LAN Manager security until the domain is completely switched over to all Windows 2000 systems (a state called native mode) Web users can still use the Secure Socket Layer (SSL) protocol, and AS/400 users can go through a Windows SNA Server Public Key Infrastructure (PKI) In public key cryptography, a user's public key is used to encrypt certain data that is to be deciphered only by that user Once this is done, that user deploys his or her own private key to decrypt the message that was encrypted using his or her public key Keys are transported in digital certificates, which are maintained by a trusted Certificate Authority (CA) such as VeriSign Windows 2000 provides a public key infrastructure (PKI) that allows Windows 2000 servers to act as CAs within a Windows 2000 domain Moreover, the PKI keeps track of certificates, generates new ones, and lets users know when one is out of date This infrastructure allows an organization to use public key cryptography completely internally Although standard Windows security can take care of the same functions as a PKI, the certificate method allows interoperability among nonWindows systems within an organization, or with users (even if they are corporate users) outside of a Windows domain This could be useful for companies doing business with other organizations over the Internet, or even for the employees of an organization when they connect via the Internet IPSec IP Security (IPSec) integration is one of the outstanding additions to the Windows OS platforms It allows full-blown, standards-based encryption to be easily implemented With advanced authentication techniques to positively identify a user, you may want to encrypt the data transmitted across the network so it cannot be intercepted, viewed, or copied in route To perform this function, Microsoft has (thankfully) adopted the IPSec standard What follows is a brief overview of this technology; the subject is covered in more detail in 9 IPSec negotiates between a sender and a receiver about how exactly to encrypt the data portion of IP packets as they traverse the network This negotiation is normally completely transparent to the end user because it occurs between the application and the server This is because IPSec is implemented below the application in the TCP/IP stack Therefore, the user and the application probably don't even know the data is being encrypted With Windows 2000, you can create security policies on servers that designate levels of security users You might, for example, dictate that all users must use IPSec to access certain directories on a server because they contain private information In another directory you might set the policy to use IPSec if the client can use it, and otherwise not to use any security at all Rather than simply encrypting everything, inducing a large processor overhead on your servers and clients, you can fine-tune your encryption methods and standards as desired
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