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As I said, a regular text editor won’t do for reading a binary file, so I needed to choose a disassembler to break the challenge binaries out into their basic blocks. I chose to use Binary Ninja because it has a very easy-to-use Python API, and it’s hobbyist-level cheap (for comparison, the industry-standard disassembler is IDA Pro, which they will sell to you for roughly an arm, and continue to pick off your fingers and toes with renewal fees). I began by writing a quick script to go through a single binary and print out the opcodes it encountered in each block, just to validate that I was able to acquire the data I wanted.
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