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How does the different types of executable packing work?

Reference to this thread: What are the different types of packers? Q1: How do packing methods like compression, protection, and encryption work, how do they differ, and which is more secure? Q2: ...
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Reversal of unknown obfuscation or encryption with known plaintext

Introduction For academical reasons I am reversing a firmware for an embedded device. I have already created a perl script which is able to parse the firmware structure and extract files from it (its ...
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What kind of compression/obfuscation algorithm is this?

I have a couple of streams that look pretty odd within a DICOM file. In a few words, DICOM is very close to what binary XML would look like. Almost all of the information from those DICOM files are ...