A Generalized Format Preserving Encryption Framework Using MDS Matrices View Full Text


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Article Info

DATE

2019-03-04

AUTHORS

Donghoon Chang, Mohona Ghosh, Arpan Jati, Abhishek Kumar, Somitra Kumar Sanadhya

ABSTRACT

The construction SPF, presented in Inscrypt-2016, was the first known substitution permutation network (SPN)–based format preserving encryption (FPE) algorithm. In this work, we present a new family of SPN-based FPE algorithms “eSPF” that significantly improves the performance and flexibility of SPF. The eSPF uses a MDS matrix instead of the binary matrix used in SPF. The optimal diffusion of MDS matrix leads to an efficient and secure design. However, this change leads to violations in the message format. To mitigate this, we propose a discarding algorithm to drop the symbols that are not the elements of the format thus preserving it. In this work, we propose the general framework of eSPF and then show how our construction can be adapted under different use cases. We provide detailed analysis of eSPF for four popular concrete instantiations—digits , alphabets, case-insensitive alphanumeric, and case-sensitive alphanumeric. We provide security and performance analysis for all these use cases. We also compare our construction with existing FPE algorithms like FFX and SPF and show that the proposed design is approx ten times faster than FFX for most of the practical applications. More... »

PAGES

3-11

References to SciGraph publications

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  • 2017-07-29. Breaking the FF3 Format-Preserving Encryption Standard over Small Domains in ADVANCES IN CRYPTOLOGY – CRYPTO 2017
  • 2009. How to Encipher Messages on a Small Domain in ADVANCES IN CRYPTOLOGY - CRYPTO 2009
  • 2014. Tweaks and Keys for Block Ciphers: The TWEAKEY Framework in ADVANCES IN CRYPTOLOGY – ASIACRYPT 2014
  • 2017-03-03. SPF: A New Family of Efficient Format-Preserving Encryption Algorithms in INFORMATION SECURITY AND CRYPTOLOGY
  • 2002-02-08. Ciphers with Arbitrary Finite Domains in TOPICS IN CRYPTOLOGY — CT-RSA 2002
  • 2002-09-13. Tweakable Block Ciphers in ADVANCES IN CRYPTOLOGY — CRYPTO 2002
  • 2009. Format-Preserving Encryption in SELECTED AREAS IN CRYPTOGRAPHY
  • 2017-11-22. eSPF: A Family of Format-Preserving Encryption Algorithms Using MDS Matrices in SECURITY, PRIVACY, AND APPLIED CRYPTOGRAPHY ENGINEERING
  • 2000-05-12. Advanced Slide Attacks in ADVANCES IN CRYPTOLOGY — EUROCRYPT 2000
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