Paper 2017/1031

Lightweight Design Choices for LED-like Block Ciphers

Sumanta Sarkar, Habeeb Syed, Rajat Sadhukhan, and Debdeep Mukhopadhyay

Abstract

Serial matrices are a preferred choice for building diffusion layers of lightweight block ciphers as one just needs to implement the last row of such a matrix. In this work we analyze a new class of serial matrices which are the lightest possible $4 \times 4$ serial matrix that can be used to build diffusion layers. With this new matrix we show that block ciphers like LED can be implemented with a reduced area in hardware designs, though it has to be cycled for more iterations. Further, we suggest the usage of an alternative S-box to the standard S-box used in LED with similar cryptographic robustness, albeit having lesser area footprint. Finally, we combine these ideas in an end-end FPGA based prototype of LED. We show that with these optimizations, there is a reduction of $16% $ in area footprint of one round implementation of LED.

Metadata
Available format(s)
PDF
Publication info
Published elsewhere. Indocrypt 2017
Keywords
MDS matrixSerial matrixRecursive Diffusion LayerLightweightS-boxLED
Contact author(s)
sumanta sarkar @ gmail com
History
2017-10-28: received
Short URL
https://ia.cr/2017/1031
License
Creative Commons Attribution
CC BY

BibTeX

@misc{cryptoeprint:2017/1031,
      author = {Sumanta Sarkar and Habeeb Syed and Rajat Sadhukhan and Debdeep Mukhopadhyay},
      title = {Lightweight Design Choices for LED-like Block Ciphers},
      howpublished = {Cryptology ePrint Archive, Paper 2017/1031},
      year = {2017},
      note = {\url{https://eprint.iacr.org/2017/1031}},
      url = {https://eprint.iacr.org/2017/1031}
}
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