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The simplest implementations of passwords and personal identification numbers (PINs) yield the simplest of all authentication mechanisms Cathy s memorized password serves as the authenticator, verifier, and base secret The verification procedure simply performs a character string comparison of the authenticator (the password provided by Cathy) and verifier (a copy of the password stored in the mail server) In practice, password-based systems incorporate various cryptographic techniques to resist attacks, notably password hashing (Wilkes 1968) Passwords work reliably only as long as they are not guessed or otherwise disclosed to potential adversaries through accident, subversion, or intentional sharing If Cathy chooses her favorite color as a password, an acquaintance might guess it and try to log on as her Since she chose a common word as a password, it s also possible that Henry or some other attacker might use a dictionary attack to discover her password in a file of hashed passwords If Cathy logs in to her mail server across the Internet, Henry might be able to intercept her password while in transit, and then use it himself Although there are technical procedures to reduce the risks of guessing, accident, or subversion, there is no way to prevent Cathy or any other user from sharing passwords Some enterprises enact strict security policies that prohibit such sharing, but such sharing often occurs anyway Within the rank and file of an organization, coworkers will often share passwords if computer access is necessary for getting a job done but computer accounts aren t easy to establish If Cathy is an administrative assistant, it s quite possible that she ll share her password with a temporary assistant who s called in to replace her if she s sick; the alternative is to create an account for the temp, and many people aren t likely to bother with that hassle And if Cathy is like most people, she may have multiple accounts To simplify life, she may decide to use the same password,.

pared to the previous cylindrical cam, allowing a smaller follower wheel and thus reduced inertia The only shortcoming of this type of groove cam follower is that the backlash between the roller and groove sides may produce noise, wear, and vibration Generally, no auxiliary members, such as locating pins or wedge locks, are necessary during the dwell periods The number of index stations on the cam-follower turret should be eight or more, to give reasonable cam and follower wheel proportions Experience has shown that a dwell into the index period is desirable, the chordal distance being about 08 of the cam diameter and the follower diameter about twice the cam diameter An average pressure angle of about 30 and a maximum pressure angle as high as 50 have been successful In Fig 1435b we see a development of this cam track For more information refer to Jacobs (1953), who utilized turrets from 24 to 60 inches in diameter weighing 200 to 2000 pounds For small quantities, SAE 4140 forged steel billets with a cam track ame-hardened to Rock C50-60 were chosen

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who do unit testing. I cover NUnit deeply in chapter 2. NUnit is easily extensible and has a large user base and forums. I d recommend it to anyone starting out with unit testing in .NET. I still use it today. You can get NUnit at http://nunit.com.

14264 Spider Cam for Intermittent Motion The spider cam (Richards, 1940, 1941) derives its name from the appearance of the follower This mechanism requires a follower having four or more indexing rollers One of its former applications was the feeding of the lm in motion-picture projectors In Fig 1436 we see the drive cam rotating clockwise at a constant speed driving a four-roller follower also clockwise In Fig 1436a the roller a is being moved in its slot, indexing the follower a quarter revolution with positive-drive action In Fig 1436b, we see the dwell cycle in which the rollers are positively xed between two contours The spider cam mechanism offers more accurate control of the dwell action than do the other indexing mechanisms shown However, the limitations of backlash in the roller groove described may offer dif culty at high speeds, giving wear, noise, and vibration in the same manner as intermittent-motion cams The design of this mechanism may vary somewhat in that the follower pivot B may be located outside the cam ring farther from the cam center A With this construction, the follower will rotate in a direction opposite that of the cam

even if the other accounts are intended for different purposes (for example, employee reviews or payroll information) Password sharing also occurs at higher levels If Cathy is a senior executive, there s a good chance that she ll share her password with her own administrative assistant, who might share it with the temp Then the assistant can process Cathy s e-mail and even log in Cathy s computer for her every morning Such flexibility might provide more benefits than shortcomings for some organizations, but it undermines the accountability that the authentication system is supposed to provide There s no way to look at computer audit trails and distinguish Cathy s own activities from those of her assistant or the temp Moreover, a secret, like a password, becomes easier to steal as it is shared among more and more people thus reflecting the wisdom of the old saying: Two people can keep a secret if one of them is dead

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