stegoPromedium

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/
steganographyimage_steganographypytorchganneural_networkdeep_learningsteganoganreed_solomondense_encoderdense_decoder
surrogate_decoder_trainingsynthetic_data_generation_from_frozen_encoderreed_solomon_error_correctionrepeated_message_majority_votingsteganogan_architecture_analysis
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