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Rapport (Rapport Technique) Année : 2017

Itsuku: a Memory-Hardened Proof-of-Work Scheme


Proof-of-Work (PoW) schemes allow to limit access to resources or to share rewards for crypto-currency mining. The MTP-Argon2 PoW by Biryukov and Khovratovich is loosely based on the Argon2 memory-hard password hashing function. Several attacks have been published. We introduce a new transposed parallel implementation attack which achieves higher performance by circumventing apparent bandwidth requirements. We then present Itsuku, a new scheme that fixes known issues by changing MTP-Argon2 parameters and adds new operations to improve memory hardness. Our scheme is built on a simple security criterion: any implementation which requires half the memory or less should induce at least a × 64 computation cost for difficulty d ≤ 100. The Itsuku proof size is typically 1 /16th of the initial scheme, while providing better memory hardness. We also describe high-end hardware designs for MTP-Argon2 and Itsuku.
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Dates et versions

hal-01653168 , version 1 (01-12-2017)


  • HAL Id : hal-01653168 , version 1


Fabien Coelho, Arnaud Larroche, Baptiste Colin. Itsuku: a Memory-Hardened Proof-of-Work Scheme. [Technical Report] A-669, MINES ParisTech - PSL Research University. 2017. ⟨hal-01653168⟩
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