stegomedium

Deep

volgactf

Task: PNG image with SteganoGAN-embedded message, only encoder model provided (no decoder). Solution: train a surrogate decoder from scratch using the frozen encoder as a synthetic data generator, then decode the stego image and Reed-Solomon recover the repeated flag.

$ ls tags/ techniques/

steganography image_steganography pytorch gan neural_network deep_learning steganogan reed_solomon dense_encoder dense_decoder

surrogate_decoder_trainingsynthetic_data_generation_from_frozen_encoderreed_solomon_error_correctionrepeated_message_majority_votingsteganogan_architecture_analysis

Analysis

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

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