DawgCTF 2021: BBomb - Phase 2

BBomb - Phase 2

Category: Binary Bomb

chal

50 points

Can you help me find my lost key so I can read my string?

Author: treap_treap

Solution

Second phase of Binary Bomb challenge chain which started with BBomb - Phase 1.

ghidra

This time the goal was to find string, which xored with 5 (literal number, not character) gives [email protected]@2m5a.

from pwn import xor
flag_encrypted = '[email protected]@2m5a'
print('Flag: DawgCTF{{{}}}'.format(xor(flag_encrypted, b'\x05').decode('utf-8')))

Output:

Flag: DawgCTF{An07h3R_rEv3r5aL_mE7h0d}

Flag

DawgCTF{An07h3R_rEv3r5aL_mE7h0d}

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