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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.

Draw the front view of the splined separator block shown below A suggested approach: Draw two circles bounding the spline teeth Draw a horizontal line through the center and offset it to form the boundary of one tooth Trim the circles and lines to form one tooth and array it about the center Using the OFFSET command, create 1/12 of the object Use MIRROR to create 1/6 of the object, and then array it about the center to nish it When you have nished the drawing, use SCALE to reduce the spline teeth so that the outer diameter is 12 Use STRETCH to narrow the outer gaps from 8 to 6

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Jared needs 24 minutes to wash the car alone and Rachel needs 24 24 48 minutes 3 Let t represent the number of hours Printing Press II needs to print the run by itself Because Printing Press I needs ve fewer hours than Printing Press II, t 5 represents the number of hours Printing Press I needs to complete the run by itself

The McGraw Hill Companies, 2010

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

The McGraw Hill Companies, 2010

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

1 1 1 t 5 t 6 6t t 5 1 1 1 6t t 5 6t t 5 t 5 t 6 6t 6 t 5 t t 5 6t 6t 30 t2 5t 12t 30 t2 5t 0 t2 7t 30 0 t 15 t 2 t 15 0 t 15 t 2 0 (This cannot be a solution because t 2 2 5 is negative)

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