Solving Two NSSCTF Reverse Engineering Challenges
[CISCN 2021 Preliimnary] babybc This challenge provdies a 64-bit ELF binary obfuscated with LLVM control-flow flattening, distributed as a BC LLVM IR file. Reverse engineering reveals the core problem is a constrained 5x5 sudoku puzzle, with custom order constraints encoded in two matrices, which ca...