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http://dx.doi.org/10.13089/JKIISC.2020.30.6.1217

High-Speed Implementation to CHAM-64/128 Counter Mode with Round Key Pre-Load Technique  

Kwon, Hyeok-dong (Hansung University)
Jang, Kyoung-bae (Hansung University)
Park, Jae-hoon (Hansung University)
Seo, Hwa-jeong (Hansung University)
Publication Information
Journal of the Korea Institute of Information Security & Cryptology / v.30, no.6, 2020 , pp. 1217-1223 More about this Journal
Abstract
The Block cipher CHAM is lightweight block cipher for low-end processors, developed by National Security Research Institute from Korea. The mode of operation is necessity for efficient operation of block cipher, among them, the counter (CTR) mode has good efficiency because it is easy to implement and supporting parallel operation. In this paper, we propose the optimized implementation for block cipher CHAM-CTR. The proposed implementation can be skipped some rounds by pre-computation. Thus it has better calculating speed than existing CHAM. Also, this implementation pre-load some of round keys to registers, before entering round functions. It makes reduced 160cycles loading time for round key load. Finally, proposed implementation achieved higher performance about 6.8%, and 4.5% for fixed-key scenario, and variable-key scenario, respectively.
Keywords
8-bit AVR Processors; CHAM block cipher; Optimized implementation;
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Times Cited By KSCI : 2  (Citation Analysis)
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