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The user selected a different icon with the mouse cursor. This can also be done with the Up, Down, Ctrl+P, Ctrl+N, Home, End, Page Up, Page Down, Right, or Left keys or a few other Shift and Ctrl keyboard combinations. All of the items were selected by pressing Ctrl+A on the keyboard. The user selected an icon item by pressing the space bar on the keyboard. The selected icons were changed by a user action or a call by your application. The scroll adjustments of GtkIconView were changed. The user pressed Ctrl+space bar on the keyboard. All of the icon items were deselected when the user pressed Ctrl+Shift+A on the keyboard.

A false positive occurs when a user is indeed an authentic user of the system, but the biometric authentication device rejects the user. A false negative, on the other hand, occurs when an impersonator successfully impersonates a user. Social acceptance is another issue to take into account when considering biometric authentication techniques. All the biometric authentication techniques discussed here are less socially accepted than entering a password. The final disadvantage for biometric authentication techniques is the key management issue. In each of these biometric authentication techniques, measurements of the user s biology are used to construct a key, a supposedly unique sequence of zeros and ones that corresponds only to a particular user. If an attacker is able to obtain a user s biological measurements, however, the attacker will be able to impersonate the user. For example, a criminal may able to copy a user s fingerprint by re-creating it with a wax imprint that the criminal puts on top of his finger. If you think of the user s fingerprint as a key, then the key management issue in this case is that we cannot revoke the user s key because the user cannot get a new fingerprint even though her original fingerprint has been stolen. By contrast, the keys in password systems are generated from passwords, and users can easily have their passwords changed if they are ever stolen or compromised. Biometric authentication becomes ineffective once attackers are able to impersonate biometric measurements.

Our example also returned the entire rendered table, and if over-the-wire performance is a concern (for example, if you have users on slow connections or you have a lot of data to transfer), you might opt for a lighterweight representation of the data If updated display information is needed, JavaScript can dynamically build DOM elements to represent the data Although this is more difficult, the flexibility and power exists when necessary There are three common choices of data formats for JavaScript calls: XML, JSON, and plain text JSON is much lighter weight than XML Plain text is sometimes useful if you just need a single value or if you want to provide a custom data format..

The string is ready to be displayed by your application. The input method needs to delete the context text. TRUE should be returned if the signal was handled. The preedited text was changed. The preedited text change was completed.

Our next example will continue with the conference theme and will list the names of the speakers who are giving sessions at a conference. If the user clicks a speaker s name, he will be directed to a speaker detail page. Figure 12.4 illustrates the speaker list, and figure 12.5 shows the speaker detail page.

Combining various authentication techniques can be more effective than using a single authentication technique For example, in the previous section, we discussed some of the disadvantages of using biometric authentication alone However, if you combine biometric authentication with another technique, such as a password or a token, then the authentication process becomes more effective The term two-factor authentication is used to describe the case in which a user is to be authenticated based upon two methods ATM cards are an example of two-factor authentication at work ATM cards have magnetic stripes that have the user s name and account number When the card is used, the user is required to enter not only the card into the teller machine, but also a PIN, which can basically be thought of as a password.