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Completely blocking the ability to set an item from a URL is the most secure option and works well for application-level roles or attributes that are typically static for the session However, in many scenarios, this technique simply won t work, such as the Report and Form on a Table discussed earlier in this section When a user clicks a row, we must have a way of determining which row was clicked to edit the proper row on the form page The most common technique for this in APEX, as well as many other popular technologies, is to pass the value in the URL Unfortunately, this gives the end user the opportunity to change the value In response to this potential security threat, the concept of a URL checksum was built into APEX When this feature is enabled, APEX uses a cryptographically strong Message Authentication Code or MAC to generate a checksum based on the parameters and their values in the URL APEX then appends this checksum to the URL This process occurs when APEX generates links to pages that require a checksum When a link is clicked that sets the value of one or more items, APEX runs the items and values through the same function Any change of a value in the URL will result in a different checksum when the request is received, thus allowing APEX to detect URL tampering A great example of this is the Report and Form on a Table Once we require a checksum for the ID item on the form page, APEX automatically generates the checksum for each link on the report page Clicking a link works exactly as it did before, except you will now see a checksum appended to the URL If you try to change the value of ID in the URL, APEX will simply return an error If this checksum were a simple hash based on a well-known algorithm, it would be easy to spoof However, since the algorithm also takes in a key or salt that is known only internally to the APEX engine, a nefarious user would need to determine the algorithm or algorithms used as well as the key.

As you can see, this is pretty straightforward You supply a name for the loop variable, such as myCounter, the start value (for example, 1), and the end value (for example, 10) Optionally, you can supply the increment, the number by which to increase or decrease the value of the loop variable If you don t provide the increment, AppleScript increments the value by 1 on each iteration through the loop This is nice, logical, and effective for many scripts Here s an example of a loop controlled by a loop variable using the default increment of 1 The code sets the startvalue variable to 1, prompts the user to choose the value of the endvalue variable from a choose from list dialog box, and then runs from the value of startvalue to the value of endvalue On each iteration, AppleScript automatically increments the numWindows counter variable by 1:

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In an oscilloscope, the horizontal deflecting plates receive a sawtooth voltage waveform This causes the beam to scan or sweep at a precise, adjustable speed across the screen from left to right as seen from the outside After each timed left- to-right sweep, the beam jumps instantly back to the left side of the screen for the next sweep The vertical deflecting plates receive the waveform to be analyzed This waveform makes the electron beam undulate up and down The combination of vertical and horizontal motions results in the display of the input waveform as a function of time This is a time-domain display Oscilloscopes can be adapted to show phenomena as a function having some domain other than time An example is a spectrum analyzer, showing signal amplitude as a function of frequency: a frequency-domain display A radar set shows the distance and direction of signal echoes from objects in the sky or in space; these are position-domain or location-domain renditions

Session State Protection is extensively documented in the APEX Application Builder Users Guide Many permutations of settings are possible for Session State Protection Instead of dedicating a large portion of this chapter to all possible scenarios, I ll provide some guidelines that cover the most common ones, which fall into two categories: items that should never be changed by a user, such as an application item storing the user s role, and items that must be set through the URL; however, allowing the user to change item values is a security risk

set startvalue to 1 set endvalue to choose from list {"3", "4", "5", "6", "7"} repeat with numWindows from startvalue to endvalue tell application "Finder" to make new Finder window end repeat

Coils can be used instead of charged plates for deflection of the electron beam in a CRT When currents pass through the coils, the beam changes direction at right angles to the magnetic lines of flux The greater the current in a deflecting coil, the stronger the magnetic field, and the greater the extent to which the beam is deflected This is an electromagnetic CRT You can use Fig 29-7 to imagine the workings of an electromagnetic CRT, just by thinking of coils outside the neck of the tube, rather than deflection plates inside the tube There are two coils, one for horizontal deflection and the other for vertical deflection

user using URL parameters, set the item-level Session State Protection attribute to Restricted - May Not Be Set From Browser This is applicable to application- and page-level items

Q: A:

Video cameras use a form of electron tube that converts visible light into varying electric currents The two most common types of camera tube are the vidicon and the image orthicon

Sensitive Items Set Through the URL The scenario described earlier using the Report and Form example is a perfect candidate for URL checksums To enable this feature, navigate to the Application Level Attributes | Security | Session State Protection Section, and click Page Select the target page of a URL that requires a checksum, in this case the form page Change the Page Access Protection attribute to Arguments Must Have Checksum You must also set the session

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