Cryptographically significant mds matrices over finite fields: A brief survey and some generalized results

Kishan Chand Gupta; Sumit Kumar Pandey; Indranil Ghosh Ray; Susanta Samanta

doi:10.3934/amc.2019045

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November 2019, 13(4): 779-843. doi: 10.3934/amc.2019045

Cryptographically significant mds matrices over finite fields: A brief survey and some generalized results

Kishan Chand Gupta ^1, , Sumit Kumar Pandey ^2,, , Indranil Ghosh Ray ^3, and Susanta Samanta ^1,

1.	Applied Statistics Unit, Indian Statistical Institute, 203, B.T. Road, Kolkata-700108, India
2.	Ashoka University, Sonepat, Haryana, India
3.	School of Engineering and Mathematical Sciences, City University London, London EC1V 0HB, United Kingdom

^* Corresponding author: Sumit Kumar Pandey

Received December 2018 Published June 2019

A matrix is MDS or super-regular if and only if every square submatrices of it are nonsingular. MDS matrices provide perfect diffusion in block ciphers and hash functions. In this paper we provide a brief survey on cryptographically significant MDS matrices - a first to the best of our knowledge. In addition to providing a summary of existing results, we make several contributions. We exhibit some deep and nontrivial interconnections between different constructions of MDS matrices. For example, we prove that all known Vandermonde constructions are basically equivalent to Cauchy constructions. We prove some folklore results which are used in MDS matrix literature. Wherever possible, we provide some simpler alternative proofs. We do not discuss efficiency issues or hardware implementations; however, the theory accumulated and discussed here should provide an easy guide towards efficient implementations.

Keywords: Diffusion, involutory matrix, MDS matrix, orthogonal matrix, branch number, Cauchy matrix, Vandermonde matrix.

Mathematics Subject Classification: Primary: 58F15, 58F17; Secondary: 53C35.

Citation: Kishan Chand Gupta, Sumit Kumar Pandey, Indranil Ghosh Ray, Susanta Samanta. Cryptographically significant mds matrices over finite fields: A brief survey and some generalized results. Advances in Mathematics of Communications, 2019, 13 (4) : 779-843. doi: 10.3934/amc.2019045

References:

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show all references

References:

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[24]	K. C. Gupta and I. G. Ray, Cryptographically significant MDS matrices based on circulant and circulant-like matrices for lightweight applications, Cryptography and Communications, 7 (2015), 257-287. doi: 10.1007/s12095-014-0116-3. Google Scholar
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[26]	K. C. Gupta, S. K. Pandey and A. Venkateswarlu, On the direct construction of recursive MDS matrices, In Des. Codes Crypto., 82 (2017), 77–94. doi: 10.1007/s10623-016-0233-4. Google Scholar
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[28]	K. C. Gupta, S. K. Pandey and A. Venkateswarlu, Almost involutory recursive MDS diffusion layers, Design, Codes and Cryptography, 87 (2019), 609-626. doi: 10.1007/s10623-018-0582-2. Google Scholar
[29]	H. Han and H. Zhang, The research on the maximum branch number of P-permutations, 2010 2nd International Workshop on Intelligent Systems and Applications, Wuhan, 2010, 1–4. doi: 10.1109/IWISA.2010.5473354. Google Scholar
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Table 1. Comparison between Vandermonde and Cauchy based constructions of MDS matrices over a finite field

Construction Type	Vandermonde based Construction $ V_1^{-1}V_2 $ and $ V_2^{-1}V_1 $	Cauchy based Construction $ M $
Type 1: No extra condition	1. Need not be involutory 2. Need not be Hadamard 3. Need not be compact	1. Need not be involutory 2. Need not be Hadamard 3. Need not be compact
Type 2: $ y_i=l+x_i $, where $ l $ is an arbitrary nonzero element in $ \mathbb{F}_{2^r} $	1. Involutory and equal 2. Need not be Hadamard 3. Need not be compact	1. Need not be involutory, whereas $ D_1MD_2 $ is involutory for some nonsingular diagonal matrices $ D_1 $ and $ D_2 $ (see Remark 21) 2. Need not be Hadamard 3. Need not be compact
Type 3: $ x_i $'s are the elements of an additive subgroup $ G=\{x_0,x_1,x_2,\dots,x_{n-1}\} $ of order $ n $ of $ \mathbb{F}_{2^r} $ and $ l \not \in G $	1. Involutory and equal 2. Need not be Hadamard 3. Compact	1. Need not be involutory, whereas $ \frac{1}{c}M $ is involutory, where c is the sum of the elements of any row 2. Need not be Hadamard 3. Compact
Type 4: $ x_i $'s are the elements of an additive subgroup $ G=\{x_0,x_1,x_2,\dots,x_{n-1}\} $ of order $ n $ of $ \mathbb{F}_{2^r} $ such that $ x_i+x_j=x_{i \oplus j} $ and $ l \not \in G $	1. Involutory and equal 2. Hadamard 3. Compact	1. Need not be involutory, whereas $ \frac{1}{c}M $ is involutory, where c is the sum of the elements of any row 2. Hadamard 3. Compact

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Construction Type	Vandermonde based Construction $ V_1^{-1}V_2 $ and $ V_2^{-1}V_1 $	Cauchy based Construction $ M $
Type 1: No extra condition	1. Need not be involutory 2. Need not be Hadamard 3. Need not be compact	1. Need not be involutory 2. Need not be Hadamard 3. Need not be compact
Type 2: $ y_i=l+x_i $, where $ l $ is an arbitrary nonzero element in $ \mathbb{F}_{2^r} $	1. Involutory and equal 2. Need not be Hadamard 3. Need not be compact	1. Need not be involutory, whereas $ D_1MD_2 $ is involutory for some nonsingular diagonal matrices $ D_1 $ and $ D_2 $ (see Remark 21) 2. Need not be Hadamard 3. Need not be compact
Type 3: $ x_i $'s are the elements of an additive subgroup $ G=\{x_0,x_1,x_2,\dots,x_{n-1}\} $ of order $ n $ of $ \mathbb{F}_{2^r} $ and $ l \not \in G $	1. Involutory and equal 2. Need not be Hadamard 3. Compact	1. Need not be involutory, whereas $ \frac{1}{c}M $ is involutory, where c is the sum of the elements of any row 2. Need not be Hadamard 3. Compact
Type 4: $ x_i $'s are the elements of an additive subgroup $ G=\{x_0,x_1,x_2,\dots,x_{n-1}\} $ of order $ n $ of $ \mathbb{F}_{2^r} $ such that $ x_i+x_j=x_{i \oplus j} $ and $ l \not \in G $	1. Involutory and equal 2. Hadamard 3. Compact	1. Need not be involutory, whereas $ \frac{1}{c}M $ is involutory, where c is the sum of the elements of any row 2. Hadamard 3. Compact

Table 2. Several results of Circulant, Circulant-like, left-circulant, Toeplitz and Hankel matrices over a finite field

Type	Dimension	Involutory MDS	Orthogonal MDS
Circulant	$ 2^n \times 2^n $	do not exist	do not exist
	$ 2n \times 2n $	do not exist	may exist (Remark 24)
	$ (2n+1) \times (2n+1) $	do not exist	may exist (Remark 24)
Type-Ⅰ	$ 2n \times 2n $	do not exist	do not exist
Type-Ⅰ	$ (2n+1) \times (2n+1) $	do not exist	do not exist
Type-Ⅱ	$ 2(2n) \times 2(2n) $	do not exist	do not exist
Type-Ⅱ	$ 2(2n+1) \times 2(2n+1) $	may exist (Example 9)	may exist
left-Circulant	$ 2^n \times 2^n $	do not exist	do not exist
	$ 2n \times 2n $	may exist (Remark 31)	may exist (Remark 31)
	$ (2n+1) \times (2n+1) $	may exist (Remark 31)	may exist (Remark 31)
Toeplitz	$ 2^n \times 2^n $	do not exist	do not exist
	$ 2n \times 2n $	do not exist	may exist (Remark 34)
	$ (2n+1) \times (2n+1) $	do not exist	may exist (Remark 34)
Hankel	$ 2^n \times 2^n $	do not exist	do not exist
	$ 2n \times 2n $	may exist (Remark 36)	may exist (Remark 36)
	$ (2n+1) \times (2n+1) $	may exist (Remark 36)	may exist (Remark 36)

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Type	Dimension	Involutory MDS	Orthogonal MDS
Circulant	$ 2^n \times 2^n $	do not exist	do not exist
	$ 2n \times 2n $	do not exist	may exist (Remark 24)
	$ (2n+1) \times (2n+1) $	do not exist	may exist (Remark 24)
Type-Ⅰ	$ 2n \times 2n $	do not exist	do not exist
Type-Ⅰ	$ (2n+1) \times (2n+1) $	do not exist	do not exist
Type-Ⅱ	$ 2(2n) \times 2(2n) $	do not exist	do not exist
Type-Ⅱ	$ 2(2n+1) \times 2(2n+1) $	may exist (Example 9)	may exist
left-Circulant	$ 2^n \times 2^n $	do not exist	do not exist
	$ 2n \times 2n $	may exist (Remark 31)	may exist (Remark 31)
	$ (2n+1) \times (2n+1) $	may exist (Remark 31)	may exist (Remark 31)
Toeplitz	$ 2^n \times 2^n $	do not exist	do not exist
	$ 2n \times 2n $	do not exist	may exist (Remark 34)
	$ (2n+1) \times (2n+1) $	do not exist	may exist (Remark 34)
Hankel	$ 2^n \times 2^n $	do not exist	do not exist
	$ 2n \times 2n $	may exist (Remark 36)	may exist (Remark 36)
	$ (2n+1) \times (2n+1) $	may exist (Remark 36)	may exist (Remark 36)

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American Institute of Mathematical Sciences

Cryptographically significant mds matrices over finite fields: A brief survey and some generalized results

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Cryptographically significant mds matrices over finite fields: A brief survey and some generalized results

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