So to achieve this, we can assist PE Explorer to obtain the signature information of this binary as follows in the file Header section. It is indispensable to confirm either this target binary is a standard Windows PE file or belongs to some other platforms, because it is mandatory for a binary file to have the PE file signature otherwise, IDA Pro won’t dissemble it. So the only possibility left to carry on without buying the license code is to reverse engineer this binary file using IDA Pro dissembler. Luckily, we have only the executable, not the source code, so that we can figure out the mechanism implemented behind the scenes. Thus we are not provided with the user password token key which would probably have part of a license key. But we have obtained this binary from some unauthentic sources. If user enters the correct information, then he would be able to proceed otherwise it echoes the wrong password message over the screen. This executable basically first validates the user identity by asking the password. This time, I have chosen a target binary which is being applied over reverse engineering, and its origin is in fact totally unknown to us. Therefore a disassembler is also platform-specific (even though there are a couple of disassemblers that contain specific support for multiple platforms). Each platform provides a different set of instructions and registers. It is trivial to say, the specific instruction encoding format and the resulting textual representation are entirely platform-specific. The disassembler merely decodes each instruction and creates a textual representation for the code. Essentially, a disassembler decodes binary machine code into a readable assembly language code. The disassembler is one of the most significant reverse engineering apparatuses. Offline code analysis is a powerful approach because it provides a good outline of the program and makes it easy to search for specific functions that are of interest. Reversing is then performed by manually reading and analyzing parts of that output. Generally speaking, there is one fundamental reversing methodology: offline analysis, which is all about taking a binary executable and using a disassembler to convert the machine code into a human-readable form. There are ‘n’ numbers of approaches for reverse engineering, and picking the appropriate one depends on the target program, the platform on which it runs and on which it was developed, and what kind of information you’re seeking to extract. This article showcases the particulars of these contents:
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