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There is one piece of this puzzle that is missing for making the possibility of global access controls based on two-factor authentication a universal reality in the near-term future. That piece could become the work of a standards body like so many other things have in relation to expanding or improving uses of the Internet. Interested parties with a stake in the result need to come together and find the common ground to create a new standard within the technology. The biggest potential problem with the universal use of two-factor authentication is data transmission speed, or, actually, the lack thereof. The rolling
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numbers on the token card are time-dependant, and any impeded transmission of traffic to and from the AAA server holding the seed record for that individual token card could make authentication calls fail frequently. The other uncontrollable element is how rapidly end users enter the number string; taking too long also contributes to a failed authentication. The improvement needed is an Internet protocol designed specifically to be recognized as authentication traffic and treated with the highest possible speed of service by all vendors routing and switching equipment. The small data payload in the packet would obviously need to be encrypted and decrypted in a uniform manner. That detail could become a part of the standard for the proposed High-Speed Authentication Protocol (HSAP). In an ideal situation, the private encryption key of the pair would be dependant on and unique to the specific token card. The universal quality of service across networks and the Internet is by far the most important part of the standard. A to-and-from guaranteed speed of 80 to 160 milliseconds for authentication packets may be all that is necessary to make this work reliably in the real world. The HSAP packets would be relatively small, and with bandwidth generally increasing and becoming less expensive, it isn t likely that this new protocol would become too much for the Internet, company WANs, or internal networks to handle as priority traffic in a quality-of-service fashion.
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Strong advocates of two-factor token cards still see some room for improvements in them. First, the shelf life of the cards needs to be extended with, for example, the capability to recharge the battery so fewer replacement cards are needed. And wouldn t it be great to have token cards that, when plugged into a computer s port, function as a private key in online encryption while still providing an independent, nonrelated random-number string for authentication Lowering the costs of procurement and implementation of the cards themselves would certainly encourage increased adoption of the technology. Card purveyors are quick to point out that use of the cards over password schemes can result in fewer help desk calls and lower cost for support. Providing a standard, easy-to-configure software communication feature to tightly couple the cooperating AAA servers to authenticate users within the organizations who agree to participate with one another in a trust model also would be beneficial.
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Exploring a Future with Global Access Controls
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There are two places to look for insight on the subject of access controls, and both of them lie outside the immediate realm of information technology. One
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A Pathway to Universal Two-Factor Authentication
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is biology, discussed next. The other is borrowed from the legal profession regarding the definition of access rights and roles discussed later in this chapter. A lesson can be learned from the interactions and diversity of controls in the human body. With so many substances in the blood flowing in your arteries and veins, you must wonder how everything works like it should without interfering with the body s other activities. The chemical interactions and the results of proteins, hormones, and peptides at work within human bodies are amazing.
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