README.md

Exploring the Six Worlds of Gröbner Basis Cryptanalysis: Application to Anemoi

This repository accompanies the paper Exploring the Six Worlds of Gröbner Basis Cryptanalysis: Application to Anemoi. It contains the code used to generate the models, create Magma scripts, and evaluate results.

Files

Overview and evaluation of results: results.ipynb

Other important files:

• anemoi.sage: Implementation of Anemoi, following the one provided by the authors here.
• attack.sage: Attack script calling Magma functions.
  • Parsing log output from attack: parseResults.sage (saves to results_Fp.sobj and results_F2n.sobj)
• constants.py: Relevant constants, such as large named primes.
• models.sage: Implementation of the algebraic models $F_{CICO}$ and $P_{CICO}$ and 3 variable orderings for every model.
  • File for testing model implementation: models_poc.ipynb
• SystemAnalysis.sage: Bézout bound, multihomogeneous Bézout bound, etc.
• modelBounds.sage: All derived formulas for theoretical bounds and experimental conjectures.

Possible reduced instances for Anemoi for different field sizes

For specifications and constraints, see Anemoi paper, page 10.

Prime fields $\mathbb{F}_p$

Prime	$\lceil \log_2(p) \rceil $	$3$	$5$	$7$	$9$	$11$
65537 = 0x10001	$16$	yes	yes	yes	yes	yes
4294967087 = 0xffffff2f	$32$	yes	yes	yes	yes	yes
18446744073709551263 = 0xfffffffffffffe9f	$64$	yes	yes	yes	yes	yes
PALLAS_BASEFIELD	$255$	no	yes	yes	no	yes
VESTA_BASEFIELD	$255$	no	yes	yes	no	yes
BLS12_377_SCALARFIELD	$253$	no	no	no	no	yes
BLS12_381_SCALARFIELD	$255$	no	yes	yes	no	no
BN_254_SCALARFIELD	$254$	no	yes	yes	no	yes

Binary fields $\mathbb{F}_{2^n}$

$n$	3	5	9
$15$	yes	yes	no
$17$	yes	yes	yes
$31$	yes	yes	yes
$63$	yes	yes	no
$65$	yes	yes	yes
$127$	yes	yes	yes
$255$	yes	yes	no
$257$	yes	yes	yes

Note: $\alpha = 7$ and $\alpha=11$ not possible due to construction of $\alpha$.