TAILIEUCHUNG - Hacker Professional Ebook part 162

Tham khảo tài liệu 'hacker professional ebook part 162', công nghệ thông tin, kỹ thuật lập trình phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Conductor A material in which electron flow occurs easily. Typically a metal usually copper sometimes silver brass or even aluminum. A wire. As opposed to an insulator. Confusion Those parts of a cipher mechanism which change the correspondence between input values and output values. In contrast to diffusion. Confusion Sequence The sequence combined with data in a stream cipher. Normally produced by a random number generator it is also called a running key. Contextual In the study of logic an observed fact dependent upon other facts not being observed. Or a statement which is conditionally true provided other unmentioned conditions have the appropriate state. As opposed to absolute. Conventional Cipher A secret key cipher. Congruence Casually speaking the remainder after a division of integers. In number theory we say than integer a exactly divides integer b denoted a b if and only if there is an integer k such that ak b. In number theory we say that integer a is congruent to integer b modulo m denoted a b mod m if and only if m a - b . Here m is the divisor or modulus. Convolution Polynomial multiplication. A multiplication of each term against each other term with no carries from term to term. Also see correlation. Used in the analysis of signal processing to develop the response of a processing system to a complicated real-valued input signal. The input signal is first separated into some number of discrete impulses. Then the system response to an impulse -- the output level at each unit time delay after the impulse -- is determined. Finally the expected response is computed as the sum of the contributions from each input impulse multiplied by the magnitude of each impulse. This is an approximation to the convolution integral with an infinite number of infinitesimal delays. Although originally accomplished graphically the process is just polynomial multiplication. It is apparently possible to compute the convolution of two sequences by taking the FFT of each .

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