International Association for Cryptologic Research

International Association
for Cryptologic Research

CryptoDB

The QARMAv2 Family of Tweakable Block Ciphers

Authors:
Roberto Avanzi , Arm Germany, GmbH, Grasbrunn, Germany; Caesarea Rothschild Institute, University of Haifa, Haifa, Israel
Subhadeep Banik , Università della Svizzera Italiana, Lugano, Switzerland
Orr Dunkelman , Computer Science Department, University of Haifa, Haifa, Israel
Maria Eichlseder , Graz University of Technology, Graz, Austria
Shibam Ghosh , Computer Science Department, University of Haifa, Haifa, Israel
Marcel Nageler , Graz University of Technology, Graz, Austria
Francesco Regazzoni , Università della Svizzera Italiana, Lugano, Switzerland; University of Amsterdam, Amsterdam, The Netherlands
Download:
DOI: 10.46586/tosc.v2023.i3.25-73
URL: https://tosc.iacr.org/index.php/ToSC/article/view/11184
Search ePrint
Search Google
Abstract: We introduce the QARMAv2 family of tweakable block ciphers. It is a redesign of QARMA (from FSE 2017) to improve its security bounds and allow for longer tweaks, while keeping similar latency and area. The wider tweak input caters to both specific use cases and the design of modes of operation with higher security bounds. This is achieved through new key and tweak schedules, revised S-Box and linear layer choices, and a more comprehensive security analysis. QARMAv2 offers competitive latency and area in fully unrolled hardware implementations.Some of our results may be of independent interest. These include: new MILP models of certain classes of diffusion matrices; the comparative analysis of a full reflection cipher against an iterative half-cipher; our boomerang attack framework; and an improved approach to doubling the width of a block cipher.
BibTeX
@article{tosc-2023-33494,
  title={The QARMAv2 Family of Tweakable Block Ciphers},
  journal={IACR Transactions on Symmetric Cryptology},
  publisher={Ruhr-Universität Bochum},
  volume={2023, Issue 3},
  pages={25-73},
  url={https://tosc.iacr.org/index.php/ToSC/article/view/11184},
  doi={10.46586/tosc.v2023.i3.25-73},
  author={Roberto Avanzi and Subhadeep Banik and Orr Dunkelman and Maria Eichlseder and Shibam Ghosh and Marcel Nageler and Francesco Regazzoni},
  year=2023
}