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This is the encrypted password file It stores the encrypted password information for user accounts In addition to the encrypted password, the /etc/shadow file stores optional password aging or expiration information The introduction of the shadow file came about because of the need to separate encrypted passwords from the /etc/passwd file This was necessary because the ease with which the encrypted passwords could be cracked was growing with the increase in the processing power of commodity computers (home PCs) The idea was to keep the /etc/passwd file readable by all users without storing the encrypted passwords in it and then make the /etc/shadow file only readable by root or other privileged programs that require access to that information An example of such a program would be the login program One might wonder, Why not just make the regular /etc/passwd file readable by root only or other privileged programs Well, it isn t that simple By having the password file open for so many years, the rest of the system software that grew up around it relied on the fact that the password file was always readable by all users Changing this would simply cause software to fail

When this applet runs, it starts loading img in the init( ) method Onscreen you can see the image as it loads from the network, because Applet s implementation of the ImageObserver interface calls paint( ) every time more image data arrives Seeing the image load is somewhat informative, but it might be better if you use the time it takes to load the image to do other things in parallel That way, the fully formed image can simply appear on the screen in an instant, once it is fully loaded You can use ImageObserver, described next, to monitor loading an image while you paint the screen with other information

ImageObserver is an interface used to receive notification as an image is being generated, and it defines only one method: imageUpdate( ) Using an image observer allows you to perform other actions, such as show a progress indicator or an attract screen, as you are informed of the progress of the download This kind of notification is very useful when an image is being loaded over the network, where the content designer rarely appreciates that people are often trying to load applets over a slow modem The imageUpdate( ) method has this general form: boolean imageUpdate(Image imgObj, int flags, int left, int top, int width, int height) Here, imgObj is the image being loaded, and flags is an integer that communicates the status of the update report The four integers left, top, width, and height represent a rectangle that contains different values depending on the values passed in flags imageUpdate( ) should return false if it has completed loading, and true if there is more image to process The flags parameter contains one or more bit flags defined as static variables inside the ImageObserver interface These flags and the information they provide are listed in Table 25-1 The Applet class has an implementation of the imageUpdate( ) method for the ImageObserver interface that is used to repaint images as they are loaded You can override this method in your class to change that behavior

Just as in the /etc/passwd file, each line in the /etc/shadow file represents information about a user The lines are made up of various standard fields, with each field delimited by a colon The fields are Login name Encrypted password Days since January 1, 1970, that password was last changed Days before password may be changed Days after which password must be changed Days before password is to expire that user is warned Days after password expires that account is disabled Days since January 1, 1970, that account is disabled A reserved field

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