Banquet: Short and Fast Signatures from AES

Carsten Baum, Cyprien Delpech de Saint Guilhem, Daniel Kales, Emmanuela Orsini, Peter Scholl, Greg Zaverucha

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

In this work we introduce Banquet, a digital signature scheme with post-quantum security, constructed using only symmetric-key primitives. The design is based on the MPC-in-head paradigm also used by Picnic (CCS 2017) and BBQ (SAC 2019). Like BBQ, Banquet uses only standardized primitives, namely AES and SHA-3, but signatures are more than 50% shorter, making them competitive with Picnic (which uses a non-standard block cipher to improve performance). The MPC protocol in Banquet uses a new technique to verify correctness of the AES S-box computations, which is efficient because the cost is amortized with a batch verification strategy. Our implementation and benchmarks also show that both signing and verification can be done in under 10ms on a current x64 CPU. We also explore the parameter space to show the range of trade-offs that are possible with the Banquet design, and show that Banquet can nearly match the signature sizes possible with Picnic (albeit with slower, but still practical run times) or have speed within a factor of two of Picnic (at the cost of larger signatures).
Original languageEnglish
Title of host publication24th International Conference on Practice and Theory of Public-Key Cryptography
Publication statusAccepted/In press - 5 Feb 2021
Event24th International Conference on Practice and Theory of Public-Key Cryptography - Virtuell
Duration: 9 May 202113 May 2021

Conference

Conference24th International Conference on Practice and Theory of Public-Key Cryptography
Abbreviated titlePKC 2021
CityVirtuell
Period9/05/2113/05/21

Keywords

  • public-key cryptography
  • Post-quantum signature
  • Secure Multiparty Computation

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