The main() method takes three command-line arguments: the name of an image file, a binary password (the initial LFSR seed), and an integer (the tap position). Create a new Color object using the result of the xor operations, and set the pixel in the new picture to that color.

Do the same for the green (using another new 8-bit integer) and, finally, the blue. Then, xor the red component with a newly-generated 8-bit integer.

extract the red, green, and blue components of the color (each component is an integer between 0 and 255). The transform() method takes a Picture and an LFSR as arguments and returns a new Picture object that is the result of transforming the argument picture using the LFSR as follows: For each pixel ( col, row), in column-major order-(0, 0), (0, 1), (0, 2). The Picture data type is part of stdlib.jar the Color data type is a Java library. Your first task is to write a data type that simulates the operation of a LFSR by implementing the following API: public class LFSR Here are a few more details about the API. The requirements of the BM algorithm we need to know the sequence of length 2n.LFSR data type. Otherwise, the linear complexity of s is the minimum level of LFSR that generates L(s).If no LFSR can generate s, the linear complexity is infinite.If s is an all-zero sequence, the linear complexity is zero.In general, we define the linear complexity of a sequence as follows In fact, this is the source of the BM algorithm. Cryptographic analysis, given a sequence a of length n, how to construct a LFSR with as few stages as possible to generate it.Generally, we want to use a LFSR with as low a level as possible to generate a sequence with a large period and good randomness. In general, we can consider LFSR from two perspectives. The sequence is an n-level m sequence if and only if the minimal polynomial of the sequence is n primitive polynomials.The two sequences are accumulated to give a new sequence whose period is the sum of the periods of the two sequences.The sequence that reaches the longest period is generally referred to as the m sequence. The Operating Mechanism of the Java Layer in Android Introduction to The Principle of Integer OverflowĪndroid Application Operating Mechanism Brief Manually Find the IAT and Rebuild It Using ImportRECīasic Functions in the heap implementation Software Reverse Engineering IntroductionĬommon Encryption Algorithms and Code Recognition Cryptographic Security Pseudo-random Number GeneratorĢ018 CISCN preliminary match oldstreamgame

Linear feedback shift register