Decoder

def decode_flag(encoded_flag):
decoded_flag = ''
for i in range(0, len(encoded_flag), 3):
decoded_flag += encoded_flag[i+2]
decoded_flag += encoded_flag[i]
decoded_flag += encoded_flag[i+1]
return decoded_flag[::-1]

encoded_flag = "!?}De!e3d_5n_nipaOw_3eTR3bt4{_THB"
decoded_flag = decode_flag(encoded_flag)
print(decoded_flag)

FLAG:

HTB{4_b3tTeR_w3apOn_i5_n3edeD!?!}

Original writeup (https://github.com/zer00d4y/writeups/blob/main/CTF%20events/Cyber%20Apocalypse/Cyber%20Apocalypse%202024%3A%20Hacker%20Royale.md).