Client Authentication in .NET

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1.1.1 Client Authentication
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Client authentication means that a client wishing to gain access and connect to the network presents its identity along with a set of credentials. As proof of authencity for the presented identity. The credentials are then used by the network to verify that the identity actually belongs to the client. We intentionally used the term client, since it can be interpreted both as a device as well as a human user, who is a consumer of a network service. For that reason, the client authentication needs to be further refined into two categories: user authentication and device authentication. Until recently, very few network security designs made a visible distinction between user authentication and device authentication. In the following we will explain the reason. Traditional architectures dealing with network access control could be divided into two categories:
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Architectures accommodating users that arrive at a fixed location, such as a local area network with fixed devices, such as data terminals, already connected to an infrastructure. The user needs to use its personal credentials to log into the network through a device (terminal), which itself typically resides in a computer room and is trusted through its wired connections. A good old world college campus terminal room scenario! The student simply trusts the network set up by the campus, as long as the college is an accredited one and the terminal is not asking for credit card numbers as login credentials! In this basic scenario, the distinction between device and user authentication although very clear for a human, is not important. The device is not authenticated at all. The user credential with a central server is the main criterion for allowing network access to the user. Architectures accommodating mobile users carrying their personal devices to gain access to a wide area network. A perfect example is cellular phone systems. The user registers
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The 3 A s: Authentication, Authorization, Accounting
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with a cellular service provider and purchases a cellular phone that works with operator s network. The operator creates a set of credentials specific for the user. The cellular phone, that the user carries, is then programmed with such credentials to access the network. Many times, the user is unaware of these credentials and the actual process of authentication during connection establishment. The device is the entity that interacts with the network and presents the credentials needed to perform authentication. The idea is: since the user always carries the same cellular phone (as long as she is loyal to her service provider) no distinction between the user and device credentials has to be made. The downside is that if the device was lost, stolen, or even cloned, the rouge or unintended user could use the device to gain access to the network without having her real identity exposed, and this could go on until the legitimate user would report a lost or stolen phone or illegitimate entries in her monthly statement from the service provider. With the proliferation of public local network providers, such as wireless hot spots serving passing customers, many sorts of vulnerabilities will appear at various corners of the architecture:
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The long-term customer operator business and legal relationship no longer exists, which means the network operator and the user cannot trust each other as. The one-to-one mapping of user device does not exist. Even if the operator could trust a user, the operator would not know what device the user may use every time they try to access the network. In other cases, such as in service organizations, government agencies, or police department, users that belong to a team can share their devices with each other.
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Such refinements require more precise definition of the network usage and security policies that in turn means the architecture must be designed more carefully. The network operator may need to make sure that both device and user are authentic, possibly using separate processes. In some cases, the device may have to even be manufactured and configured with credentials for access to the network. (For instance, cable modems for cable Internet Service Provider (ISP) networks are produced this way.) In such cases, proper protection must be in place, so that the credentials on the device can not be tampered with. The network operator also needs to make sure the user presents accurate identity and proper credentials that can identify her at the time of use, so that the various users can be distinguished even when they are using a shared device. Device authentication credentials can be certificates or cryptographic keys that are loaded in the devices either by the manufacturer in the factory or by the network operator at the time of service initiation. When designed properly and in a modular manner, the device authentication process should be transparent to the user. In fact, the user should not even be allowed to access device authentication credentials. On the other hand, user authentication credentials are personalized, typically given to the user in an out-of-band method. Examples are over a phone call by the user stating some secrets about her identity or through a face-to-face meeting after presentation of a driving license, company badge, and so on. Upon identification of the user, the system operator issues the authentication credentials for the user. The credentials must be carried by the user at all times either memorized (password) or in the form of a token such as a secure ID card, a certificate on some sort of cryptographic module. The user applies her authentication credentials on the device provided for access to the network to connect to the network.
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