The method is called Brute-Force, then try to guess the Key is every possible value, which means that it must be a sheep. Suppose that the average will be able to carve out a Key. When the Key has been to try to get a number equal to half of all Key in table 2.2 shows that it will take some time. To carve the different Key length by assuming in sheep code 1 time takes 1 micro-seconds, which is about the speed of the computer medium current (approx. 200 MHz speed) can see that the length of the Key that starts with 56-bit security is at high speed, but the use of a computer, such as a MPP supercomputer, which assumes that there is a working speed equal to 1 million times, and you will see that the length of the Key is 128 bit secure start.
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