Wun Code

Reverse Engineering exam

This exam measures what you've actually learned, in three stages: Easy, Medium, then Hard. Each stage unlocks the next. There are no hints and no ready-made solutions, so it's just you and your code, graded automatically like in the lessons.

  1. Stage 1Locked

    Easy

    • Reading an ELF headerPick the byte order from a field in the header12 min
    • Breaking repeating-key XORRecover a repeating key from a known prefix14 min
  2. Stage 2Locked

    Medium

    • Extracting strings with their offsetsFind runs of printable characters and the offset of each14 min
    • A disassembler with jumpsDisassemble a program with a conditional jump15 min
  3. Stage 3Locked

    Hard

    • An emulator with jumpsRun a program with a conditional jump and a loop18 min
    • Reversing the keygenUndo a chain of transformations on a long key20 min