Clear it in 3 steps
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Start the environment
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Investigate the target
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Submit the flag
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Recover Fragmented JPEG File
Mission
Analyze the fragments and `.meta` sidecars under `fragments/` to reconstruct a fragmented JPEG. Determine the order from the SHA-256 hash chain rather than filenames, then recover the flag from the reconstructed JPEG COM comment.
Hints
Hint 1 Show
The fragment filenames' numbers do not reflect order; chain them by each .meta's seq/sha256/prev_sha256
Hint 2 Show
The real chain starts at prev_sha256=ROOT and completes at total fragments (a 1-fragment decoy chain and a .meta-less junk fragment exist)
Hint 3 Show
Concatenate in order to rebuild a valid JPEG and read the flag from its COM segment