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Create and follow well-defined policies for verifying the identity of a user before resetting his or her password. To prevent a hacker from pretending to be a user and getting the password reset to attack the network with the user's account, use a process to validate the identity of the user. For example, you might call the user's manager to verify the request before changing the password. Kerberos Authentication Kerberos is a network authentication protocol that provides strong authentication for client/server applications by using symmetric key cryptography. Kerberos is designed to provide a single sign-on to a heterogeneous environment. Because most operating systems are capable of communicating across a network and support Kerberos authentication, and Kerberos is scalable enough to operate on the Internet, it can be used as an authentication mechanism on the Internet and in other heterogeneous environments. Kerberos allows mutual authentication and encrypted communication between users and services; therefore, it can be used over public communications mediums.
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The Kerberos authentication process is more stringent than using a user name and password for authentication. When a user signs onto the local operating system, a local agent (process) sends an authentication request to the Kerberos server. The server responds by sending the encrypted credentials for the user attempting to sign onto the system. The local agent then tries to decrypt the credentials using the user-supplied password. If the correct password has been supplied, the user is validated and given authentication tickets, which allow the user to access other Kerberos-authenticated services. In addition to the tickets, the user is also given a set of cipher keys that can be used to encrypt all data sessions. The following are some definitions that are used in subsequent explanations: Realm. An organizational boundary that is formed to provide authentication boundaries. Each realm has an authentication server (AS) and a ticket-granting server (TGS). Together the AS and TGS form a Key Distribution Center (KDC). All services and users in the realm receive tickets from the TGS and are authenticated with the AS. This provides a single source of authority to register and authenticate with. Realms can trust one another, providing the capability to scale Kerberos authentication. Authentication server (AS). In a Kerberos realm, the AS is the server that registers all valid users (clients) and services in the realm. The AS provides each client a ticket-granting ticket (TGT) that is used to request a ticket from a TGS. Ticket-granting server (TGS). To minimize the workload of the AS in a Kerberos realm, the TGS grants the session tickets used by clients to start a session with a service. The client must use the TGT issued by the AS to request a session ticket from a TGS. Cross-realm authentication. Cross-realm authentication is the capability of users in one realm to be authenticated and access services in another realm. This is accomplished by the user's realm registering a remote ticket-granting server (RTGS) on the realm of the service. Rather than having each realm authenticate with each other, cross-realm authentication can be configured in a hierarchical fashion. This eases authentication for the AS and TGS, but might force the client to contact several RTGSs to access a service.
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Remote ticket-granting server (RTGS). An RTGS performs the same tasks as a TGS, but for a remote realm (a realm the user is not associated with). To do this, the TGS in the realm the user is in must register with the TGS of the realm of the service the user is accessing (the RTGS). Ticket. A ticket is a block of data that allows users to prove their identity to a service. Each ticket is stored in a ticket cache on the user's local computer and is time stamped, so after a given amount of time (typically 10 hours), the ticket expires and is no longer valid. Limiting the length of time a ticket is valid reduces the chances of a hacker obtaining a ticket and being able to use it for unauthorized access. Ticket cache. A ticket cache is a portion of memory that stores all of a user's Kerberos tickets. This cache is separate from the cache of the application that is using the ticket. With the tickets in their own cache, users need only provide their credentials once per session, even if several applications are using that ticket to access a service. Ticket-granting ticket (TGT). A TGT is a ticket that is granted as part of the Kerberos authentication process and is stored in the ticket cache. The TGT is used to obtain other tickets that are specific to a service. For instance, if a user wanted to gain access to a specific service, his or her TGT would be used in a negotiation process to get the additional ticket. Each service requires its own ticket. Authenticators. A series of bits, a symbol, or a group of symbols that are inserted into a transmission or message in a predetermined manner and are then used for validation. Authenticators are typically valid for five minutes. This is similar to the use of a cookie for being authenticated on a Web site. An authenticator can only be used once. This help prevents someone from intercepting an authenticator and then reusing it. Principal. A principal is any unique entity to which Kerberos can assign tickets.
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Because Kerberos is a single sign-on environment, the tickets issued by the Kerberos server provide the credentials required to access additional network resources. This means that although the user is still required to remember his or her password, he or she only needs one password to access all systems on the network to which he or she has been granted access. In addition to using Kerberos for authentication, it is possible to configure Kerberos to encrypt, thereby ensuring communication between authenticated hosts. Kerberos is implemented by a KDC, which contains the information that allows Kerberos clients to authenticate. The information is contained in a database that makes single sign-on possible. The KDC's database does not work in the same manner as many other databases. In Kerberos, all network information (data about users, services, and hosts) is stored in the Kerberos
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