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Authentication is the process of proving one's identity to someone else As humans, we authenticate each other in many ways: we recognize each others' faces when we meet; we recognize each others' voices on the telephone; we are authenticated by the customs official who checks us against the picture on our passport In this section we consider how one party can authenticate another party when the two are communicating over a network We focus here on authenticating a "live" party, at the point in time when communication is actually occurring We will see that this is a subtly different problem from proving that a message received at some point in the past (eg, that may have been archived) did indeed come from that claimed sender This latter problem is referred to as the digital signature problem, which we explore in section 74 When performing authentication over the network, the communicating parties can not rely on biometric information, such as a visual appearance or a voiceprint Indeed, we will see in our later case studies that it is often network elements such as routers and client/server processes that must authenticate each other Here, authentication must be done solely on the basis of messages and data exchanged as part of an authentication protocol Typically, an authentication protocol would run before the two communicating parties run some other protocol (eg, a reliable data transfer protocol, a routing table exchange protocol, or an email protocol) The authentication protocol first establishes the identities of the parties to each others' satisfaction; only after authentication do the parties get down to the work at hand As in the case of our development of a reliable data transfer protocol, rdt, in 3, we will find it instructive here to develop various versions of an authentication protocol, which we will call ap ("authentication protocol"), and poke holes (ie, find security flaws) in each version as we proceed Let's begin by assuming that Alice needs to authenticate herself to Bob.

They needed the ability to gather and prepare themselves without impeding the active trading that was already in progress, as well as a way to more easily move the active traders out of the trading area when their time expired The answer: more space In a great stroke of luck, the only other tenants in the Long Island City building had moved out months before, so there was a tremendous amount of available space in the building NYBOT quickly made a bid and acquired the space Once the space was acquired, Comdisco (the owners of the building) set to work preparing it to NYBOT s specifications, and in just a couple of days the space was ready to be used as setup space for incoming traders (Comdisco assures us that under normal circumstances, this build-out would have taken a couple of weeks, if not longer.

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Copyright 1999 Gary McGraw and Edward Felten. All rights reserved. Published by John Wiley & Sons, Inc.

Perhaps the simplest authentication protocol we can imagine is one where Alice simply sends a message to Bob saying she is Alice This protocol is shown in Figure 73-1 The flaw here is obvious - there is no way for Bob to actually know that the person sending the message, "I am Alice" is indeed Alice For example, Trudy (the intruder) could just as well send such a message

) Comdisco had obtained and set up tables, chairs, phones, and workspaces This first upgrade greatly reduced tension throughout the organization, as it allowed members a space to work that was not on the trading floor, or in the way of active traders Since trading was not scheduled to resume until Monday, few members had any plans to visit the Queens site before then However, Pat, Steve, and the Board realized that Monday morning would be total chaos, what with most of the 1,000 members arriving at once, all looking for their familiar booths, trading pits, phones, and other facilities Many of them would not be familiar with the staggered schedule and would expect to trade all day as normal As this.

file:///D|/Downloads/Livros/computa o/Computer%20Netwopproach%20Featuring%20the%20Internet/authenticationhtm (1 of 9)20/11/2004 15:53:05

CHAPTER SECTIONS: 1 / 2 / 3 / 4 / 5 / 6 / 7 / 8 / 9 / 10

firms on Wall Street, the number often quoted for downtime during the trading day is $2 million per trader per 20-minute outage. One assumption in that $2 million number is that all trades made on the trading floor are profitable. Consider that the outage could have prevented a trader from making a moneylosing deal, thus saving the firm money. Wall Street firms are oddly loath to discuss this possibility. Of course, the traders salaries and carrying costs are lost, and while many traders do make a lot of money for both themselves and their firms, very few of them can consistently bring in $2 million dollars every 20 minutes. A trading firm s loss is not as easily quantifiable as the loss to the development organization, because the trading firm s losses are also composed of opportunity losses.3 Other industries direct costs of downtime, as reported by various services, are listed in Table 3.1. Over time, of course, these values will change; the actual values are less important than the orders of magnitude of the values, and how much the costs can vary by industry. You don t need to precisely quantify a loss to know that a significant loss has occurred.

In the case that Alice has a well-known network address (eg, IP address) from which she always communicates, Bob could attempt to authenticate Alice by verifying that the source address on the IP datagram carrying the authentication message matches Alice's well-known address If so, then Alice would be authenticated This might stop a very network-naive intruder from impersonating Alice But it wouldn't stop the determined student studying this book, or many others!

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