stegoProhard

Blockchain

caplag

Task: Extract hidden data from 13 PNG images using blockchain steganography. Solution: Alpha channel LSB extraction reveals blockchain blocks with Reed-Solomon encoding; assembling data blocks by index yields the flag.

steganography lsb png rgba blockchain stego alpha-channel reed-solomon error-correction

alpha_channel_lsbblockchain_data_structurereed_solomon_decodingbinary_extraction

$ ls tags/ techniques/

steganography lsb png rgba blockchain stego alpha-channel reed-solomon error-correction

alpha_channel_lsbblockchain_data_structurereed_solomon_decodingbinary_extraction

Analysis

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$ python3 exploit.py --target 192.168.1.1 --port 8080
[*] Connecting to target...
[+] Shell obtained!

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