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
Reconstruct a three-disk RAID5 scenario as a safe file-level parity fixture. No block device, mdadm, or loop device is used. Recover the missing-stripe secret from the layout and surviving parity record.
Use evidence/raid-layout.txt to identify the failed disk
disk3.img is the surviving parity record
Decode the Base64 value after the | character with base64 -d