$ cat writeup.md…
$ cat writeup.md…
grodno_new_year_2026
Task: ELF binary with anti-debug protection that encrypts a flag using XOR with position-dependent key and ROL-3 bit rotation. Solution: Reversed the algorithm (ROR-3 then XOR with 0x67+i), discovered a SAR vs SHR compiler bug that broke verification, and patched the binary to confirm the correct decrypted flag.
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