swiss hacking challenge 2024 - least-suspicious-bit
Difficulty: baby
Categories: misc, stego
Author: NoRelect
Just as one might scrutinize the slight variations between “grey” and “gray”, steganography enthusiasts meticulously analyze the least significant bit to conceal and reveal hidden messages. Yet, for the vast majority of people, the nuances of LSB steganography remain as obscure and unremarkable as the differences between the spellings of “grey” and “gray.”
Files
We are given a grey.png file.
Exploitation
Running zsteg on the file immediately shows the flag:
Flag
shc2024{lsb_stego_like_in_the_g00d_old_days}
Conclusion
zsteg for the win!