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One way C programmers often access array elements is through pointers Accessing arrays through pointers is important if you wish to understand C strings If you wish to do any substantial C programming, it also becomes important, as C programmers use pointers in seemingly undecipherable ways Consider the following code:

password-change attack, which requires physical access to change the admin password Unix environments have had this issue as well, where a user can simply boot into single-user mode and change the root password (which also requires physical access to the machine) The fact that physical access to a device no longer means breaking into data centers or bypassing building security barriers is tough for the IT world because historically it s just a matter of time before someone is able to break through any physical security measures to access data on a disk (it should be noted that on some mobile devices it is the expandable memory slot, such as the MicroSD, that holds all the sensitive data) The best solution for this problem is to design systems assuming physical access will be granted to untrusted parties, and not to assume that any physical security layer will stand the test of time Unlike many other computing environments from dedicated servers to cloud computing physical security will be the number-one issue facing mobile devices

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void expenses() { float expenses[10]; for(int i = 0; i < 10; i++) { expenses[i] = 10000 + i; } float * expensePointer = &expenses; for(int i = 0; i < 10; i++) { printf("%f\n", *(expensePointer+i)); } }

This result is compared to the response and should be identical if the password is valid (see Figure 8-1) The challenge-response system prevents replay attacks because a response is only valid for a specific challenge Furthermore, scrambling the response makes the password inseparable from the challenge The next connection will require a different challenge, and any previously captured response will therefore not work

The function s first half assigns values to each array element The function s second half then logs those values However, the second half, rather than referring to each

Secure Data Storage (on Disk)

We ve all seen movies where someone knocks on a door to a villain s lair A little window in the door slides opens, eyes look through, and a burly voice grunts out, What s the password The hero, watching from around the corner, overhears a henchman s response and uses the same password to gain entry a few moments later We all sit on the edge of our seats, because we know that an intense bar brawl, gunfight, or chop-socky scene is sure to follow This scene illustrates a number of potential problems with passwords Whenever a password is used, an opportunity is available to intercept it Overhearing, watching over a shoulder, wiretapping a line, and logging keystrokes are all techniques that can be used to compromise a password Shared passwords are even worse, because more opportunities for interception are present

3:

Securing data on disk relates closely to the previous issue, which is the physical loss of a mobile device As with laptops, the loss of a mobile device will be a non-issue if the data stored on that device is inaccessible to unauthorized parties In addition to sensitive documents, information on many mobile applications is stored locally, including password files and authentication tokens, which all need to be protected as well The ability to store sensitive information locally in a secure manner, and also to keep it accessible to the applications that need it to function properly, is an important requirement for secure mobile computing

element by value, does so by reference It first assigns a pointer to the array, which is the address of the first element Remember, the & character preceding a variable means it is the variable s address, not its value The function then increments/moves the pointer by 1, causing the pointer to point to the next element s address in the array With each loop, the printf statement prints the value pointed to by the expensePointer Remember the * character preceding a variable means it is the variable s value, not its address

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