reversehard
Skretch
tamuctf
Task: 372MB Scratch 3 project with 1.7M blocks verifying PNG through 38,566 linear equations. Solution: Parse obfuscated Scratch blocks, substitute runtime variable goodbye=0, solve consecutive-index equations sequentially starting from PNG header bytes.
$ ls tags/ techniques/
scratch_block_parsingexpression_tree_evaluationsequential_equation_solvingruntime_variable_substitution
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