reverseeasy

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spbctf

Task: Generate serial number for SPbCTF_2020! from a JAR file. Solution: Decompile Java bytecode, understand XOR swap algorithm on big-endian integers, implement keygen in Python.

$ ls tags/ techniques/
javabytecodekeygenbig_endianxor_swapjar
keygen_implementationxor_swap_analysisjar_decompilation
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