cryptoProeasy
XORDECRYPT
bluehensctf
Task: a noisy PNG hides the flag behind a custom XOR-based image transform. Solution: treat 0x67 as the initial state and decrypt each row independently with per-channel XOR feedback to reveal the overlaid flag text.
$ ls tags/ techniques/
xor_feedback_decryptionrow_wise_processingper_channel_state_recovery
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