Genesis BlockCrypto contest ops
ContestsGenesis Block VIIMask Leak
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LiveExtremeSide-Channel450 pts

Mask Leak

Reconstruct a masked AES key schedule from power traces.

Challenge brief

You receive 2k power traces from a first-order masked AES-128 on a Cortex-M target. The mask refresh is slightly desynchronized on round 8. Recover the full key and submit it as a Genesis Block flag.

Flag format: GB{...}

Puzzle artifacts

board_notes.md

Target board notes

Cortex-M4 @ 168MHz
masking: first-order
refresh desync: round 8
sample rate: 500 MS/s

Demo artifacts — synthetic files for the interactive MVP flow

Submit proof

Format: GB{...}

Client-side demo verification. Live events rate-limit wrong answers.

Demo verification is client-side for this MVP. Live contests will score server-side. Lattice Fold demo flag: GB{lattice_short_basis_recovered}