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data in a cookie in encrypted form. Even when just storing the session identifier in a cookie or URL to keep track of users, such Web applications must ensure those identifiers are not easily guessable, to limit the risk of session hijacking. 2. Introduce a MANAGER and unique session identifiers to keep track of active session objects. If a user is only allowed to log in once, you might use a user s identification as the session identifier otherwise a synthesized identifier is sufficient. A publicly-accessible session identifier must be protected against fraud, which in many cases disallows the user s identifier from use directly as their session identifier. Apply MANAGER [Som98] or RESOURCE LIFECYCLE MANAGER [POSA3] as a reference for implementing the MANAGER. The MANAGER provides an interface for other system components to access a session object corresponding to its identifier. 3. Define session time-out semantics. Lingering unused session objects carry risk, not only for security reasons, but also for memory management. The MANAGER should periodically check for inactive sessions and release them. If this inactivity time out is short, it effectively prohibits misuse of a session by an unidentified user. On the other hand, if it is shorter than the typical transaction time of a user, such a session time-out gets annoying. 4. Define re-authentication time-out semantics. In security-sensitive environments, the MANAGER should also enforce re-authentication at the CHECK

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Flexibility is one of ProphetCharts main advantages, and one example of this is that you can alter the color and style of any individual object on any chart. As you are applying drawn objects, whatever settings you most recently used for that tool will be applied until such time as you either customize that tool or modify an individual object that you drew earlier. To alter the color or style of a trendline you ve already drawn, right-click on the trendline and choose Change Style/Color from the

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POINT (287) for long-lived active sessions to protect a user s session from misuse and the user from forgetting his password. Appropriate values for such time-outs depend heavily on the given domain and use profile. For example, Yahoo! uses cookies that live for about five years to identify a user. However, from time to time, and whenever accessing sensitive data, a user needs to reauthenticate. In a system in which access rights management is separate, this re-authentication also provides a means of updating a user s access rights that are cached in the session object. 5. Allow a user to log on and log off at the check point. Even though it seems trivial, you shouldn t forget to provide the mechanism that allows a user to establish the security session and to allow them to cancel a session of their own will. This actively allows the user to care about security, which can be an important security measure. During log-in the MANAGER creates and initializes the session object with the user s access rights and other relevant data.

Our medieval city council comes up with the concept of a day pass. This day pass is issued by the gate guards to every foreign visitor entering the city, and needs to be returned when leaving the city. To distinguish the more desirable guests from lessliked ones, the passes are color coded: peasants looking for work get a green pass, the private visitors of city inhabitants a white one, while merchants receive a bronze pass that they can keep for later visits. A visitor is obliged to show his pass to everybody asking for it. Since the city is small enough for all citizens to know each other, the city does not need to issue passports for its inhabitants.

But if you spend any time backpacking, driving, and/or hiking to a location only to experience a problem with your gear, your time and the trip are wasted Weatherproof camera case Keeping your PowerShot G11 warm and dry will bene t you in many shooting situations Moisture and condensation can wreak havoc with your camera s ability to focus or get a clear shot especially when coming inside after skiing, snowboarding, or photographing a swim meet Keeping the camera warm or in a weatherproof case until it warms up keeps condensation from forming inside the camera Tripod and monopod A lightweight but sturdy tripod such as those from Manfrotto, Gitzo, and Cullman are indispensable In addition, a versatile ball head with a sturdy quick-release plate increases the steadiness and speed of shooting, and is mandatory for long exposures Tele Converter TC-DC58D.

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