BE02 - 100pts

Briefing

Download the file and find a way to get the flag. Contents: rot13
Challenge Files:

Solution

  1. 1.
    We could decompile the binary using Ghidra to understand how it works, but trial and error is faster for this challenge.
  2. 2.
    Sending a large number of characters as input (a >32 character string) causes a segmentation fault and prints the flag.
  3. 3.
    We can use 33 a's as input to get the flag: python -c "print('a'*33)" | ./rot13.

Flag

luckyNumber13
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