PMNS for cryptography: A guided tour

Nicolas Méloni; François Palma; Pascal Véron

doi:10.3934/amc.2023033

Article Contents

2024, Volume 18, Issue 2: 342-359. Doi: 10.3934/amc.2023033

This issue Previous Article Dual transform and projective self-dual codes Next Article On the minimum distance, minimum weight codewords, and the dimension of projective Reed-Muller codes

PMNS for cryptography: A guided tour

Laboratoire IMath, Université de Toulon, La Garde, France

Received: April 2023

Early access: September 2023

Published: April 2024

Abstract / Introduction Full Text(HTML) Figure(0) / Table(9) Related Papers Cited by

Abstract

The Polynomial Modular Number System (PMNS) offers an alternative to the conventional binary multi-precision representation system for large integers. Its effectiveness has been demonstrated for various cryptosystems using prime field arithmetic [2,4,6], with prime sizes ranging from 256 to 736 bits. However, as the size of $ p $ increases, the relative performance of PMNS compared to standard arithmetic diminishes. Furthermore, the generation process of a PMNS has a worst-case complexity of $ {\mathcal O}(2^n) $, where $ n $ denotes the number of symbols used to represent an integer modulo $ p $ in this representation system. In this paper, we present several alternatives and improvements to the construction and implementation processes of PMNS, which are tailored to the size of $ p $.

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Mathematics Subject Classification: Primary: 11T06, 11T71; Secondary: 94A60, 68W99.

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Full Text(HTML)

Table 1. Number of cycles to compute a PMNS modular multiplication, gcc 12.1.0, i9-11900KF

Alg./size of $ p $	256	512	1024
Montgomery	121	432	1709
This work	122	443	1728

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Table 2. Optimal polynomial degrees vs practical ones used in implementation per size of prime considered

size of $ p $	256	512	1024	2048	4096	8192
$ n_{\text{opt}64} $	5	9	17	33	65	129
$ n_{64} $	5	9	19	40	83	187
$ n_{\text{opt}128} $	3	5	9	17	33	65
$ n_{128} $	3	5	9	18	36	72

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Table 3. Comparative table of performances for Red-64 and Red-128 in number of processor cycles for one modular multiplication on Intel processor i9-11900KF with gcc 12.1.0

size of $ p $	256	512	1024	2048	4096	8192
Red-64	122	443	1709	7690	33471	169070
Red-128	245	720	2367	10920	39446	156310

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Table 4. Number of cycles to compute a modular multiplication using GnuMP and PMNS on Intel processor i9-11900KF with gcc 12.1.0

Size	1024	2048	4096	8192
GnuMP
$ n $	16	32	64	128
Low level	1715	5501	16897	53042
Classical Mont.	1534	4653	14522	44587
Mont. CIOS	1187	4661	16793	61478
This work
$ n $	19	40	84	187
Red-64	1709	7690	33471	169070
$ n $	-	-	-	72
Red-128	-	-	-	156310

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Table 5. Number of cycles to compute a modular multiplication between two 8192-bit integers using GnuMP and PPMNS (for any $ E(X) $) on Intel processor i9-11900KF with gcc 12.1.0

5-core	6-core	8-core	Low level	Classical Mont.	Mont. CIOS
$ n $=187			$ n $=128
51979	46224	40778	53042	44567	61478

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Table 6. Number of cycles to compute a modular multiplication between two 8192-bit integers using GnuMP and PPMNS (for $ E(X) = X^{189}-2 $) on an Intel processor i9-11900KF with gcc 12.1.0

6-core	Low level	Classical Mont.	Mont. CIOS
$ n $=189	$ n $=128
42510	53042	44567	61478

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Table 7. Number of cycles to compute a modular multiplication for 2048-bit and 4096-bit integers using GnuMP, PMNS and PPMNS on an Intel processor i9-11900KF with gcc 12.1.0

Method/Size	2048	4096
$ n $	32	64
Low level	5501	16897
Classical Mont.	4653	14524
Mont. CIOS	4607	16793
$ n $	40	84
Red-64	7491 (1-core) 10165 (2-core)	36195 (1-core) 17756 (6-core)
Red-128	10920 (1-core) 15314 (2-core)	39446 (1-core) 25797 (4-core)

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Table 8. Number of cycles to compute a modular multiplication for 2048, 4096 and 8192-bit integers using Toeplitz form vs random matrix form on Intel processor i9-11900KF with gcc 12.1.0

Size	2048	4096	8192
8 cores
Toeplitz Montgomery-like	14421	18193	37026
This work	14529	22782	40778

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Table 9. Number of cycles to compute a modular multiplication for 1024, 1664 and 2048-bit integers using Toeplitz form vs GnuMP on Intel processor i9-11900KF with gcc 12.1.0

Size	1024	1664	2048
Low level	1715	4039	5501
Classical Mont.	1539	3466	4653
Montgomery CIOS	1187	3153	4607
Toeplitz (this work)	1449	3454	5489

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