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and give the best results. Remember to keep a diary, so when you revisit a venue you know how much time and money to allow for transportation. Once at a location it is important to be as comfortable as you can. Is it possible to eat out well good quality and appropriate food (see 15) Remember we are what we eat, and if we are away for a long period of time good diet becomes especially important. (You may be able to get away with one or two days of poor eating, but it will eventually catch up with you!) Communication is important, whether it is with loved ones who cannot be with you, or to set up details for the next trip. Getting access to cheap phone calls can be very important. Skype (www.skype.com) is highly recommended as a way of making cheap calls from a computer, but you do of course need Internet access (wire-free or through Ethernet cable or similar). Also, when away from home, make sure you have the correct adapter so you can charge your electrical equipment. At the very least, ensure it is fully charged before you leave home, and perhaps take a spare mobile!

The lowest level at which a malicious program could theoretically infect a program is the CPU or other hardware devices that use upgradeable firmware Most modern CPUs actually run a very low-level code that implements each and every supported assembly language instruction using low-level instruction called micro-ops ( -ops) The -op code that runs inside the processor is called firmware, and can usually be updated at the customer site using a special firmware-updating program This is a sensible design decision since it enables software-level bug fixes that would otherwise require physically replacing the processor The same goes for many hardware devices such as network and storage adapters They are often based on programmable microcontrollers that support user-upgradeable firmware It is not exactly clear what a malicious program could do at the firmware level, if anything, but the prospects are quite chilling.

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The technique of the control variate can be used when there is some function that closely approximates the function we have to deal with and that we can integrate exactly. To be consistent with the notation used earlier in the chapter, let us assume that the function is g(x) and the integral is I . The integral I could be an area, a volume, a mean value, a variance, or some other quantity. Now, let the function that closely approximates g(x) also known as the control variate be C(x), and let the integral of C(x) be denoted IC . We can always change the variables so that the integral over the range of the problem is unity. Then we can de ne a new function Z(x) as Z(x) = g(x) [C(x) IC ] (17.51)

Malicious firmware would theoretically be included as a part of a larger malicious program and could be used to hide the existence of the malicious program from security and antivirus programs It would compromise the integrity of the only trustworthy.

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where is a factor to be determined. Because C(x)dx = IC it follows that, regardless of the value of , Z(x)dx = g(x)dz (17.53) (17.52)

component in a computer system: the hardware. In reality, it would not be easy to implement this kind of attack. The contents of firmware update files made for Intel processors appear to be encrypted (with the decryption key hidden safely inside the processor), and their exact contents are not known. For more information on this topic see Malware: Fighting Malicious Code by Ed Skoudis and Lenny Zeltser [Skoudis].

There are different types of motives that drive people to develop malicious programs Some developers are interest-driven: The developer actually gains some kind of financial reward by spreading the programs Others are motivated by certain psychological urges or by childish desires to beat the system It is hard to classify malware in this way by just looking at what it does For example, when you run into a malicious program that provides backdoor access to files on infected machines, you might never know whether the program was developed for stealing valuable corporate data or to allow the attacker to peep into some individual s personal files Let s take a look at the most typical purposes of malicious programs and try to discover what motivates people to develop them Backdoor Access This is a popular end goal for many malicious programs.

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If the integrations are approximated by Monte Carlo simulation, it similarly follows that the expected values of the simulation of the integral of Z will be the expected value of the integral of g. The basic idea of the control variate approach is to simulate the integration of Z rather than g. Why this should work is illustrated in Figure 17.12, which shows two control variates that approximate the function cos2 , whose integration was discussed in earlier sections. One control variate is a linear approximation; the other is cubic. If we let = x/2, the equations for the control variates become C(x) = 1 x C(x) = 1 3x 2 + 2x 3

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