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Sensors 2014, 14(1), 975-994; doi:10.3390/s140100975
Article

Efficient Hardware Implementation of the Lightweight Block Encryption Algorithm LEA

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Received: 13 November 2013 / Revised: 13 December 2013 / Accepted: 27 December 2013 / Published: 8 January 2014
(This article belongs to the Section Physical Sensors)

Abstract

Recently, due to the advent of resource-constrained trends, such as smartphones and smart devices, the computing environment is changing. Because our daily life is deeply intertwined with ubiquitous networks, the importance of security is growing. A lightweight encryption algorithm is essential for secure communication between these kinds of resource-constrained devices, and many researchers have been investigating this field. Recently, a lightweight block cipher called LEA was proposed. LEA was originally targeted for efficient implementation on microprocessors, as it is fast when implemented in software and furthermore, it has a small memory footprint. To reflect on recent technology, all required calculations utilize 32-bit wide operations. In addition, the algorithm is comprised of not complex S-Box-like structures but simple Addition, Rotation, and XOR operations. To the best of our knowledge, this paper is the first report on a comprehensive hardware implementation of LEA. We present various hardware structures and their implementation results according to key sizes. Even though LEA was originally targeted at software efficiency, it also shows high efficiency when implemented as hardware.
Keywords: LEA; lightweight block cipher; hardware implementation; FPGA; ASIC LEA; lightweight block cipher; hardware implementation; FPGA; ASIC
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Lee, D.; Kim, D.-C.; Kwon, D.; Kim, H. Efficient Hardware Implementation of the Lightweight Block Encryption Algorithm LEA. Sensors 2014, 14, 975-994.

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