Abstract
The demand for low resource devices has increased rapidly due to the advancements in Internet-of-things applications. These devices operate in environments that have limited resources. To ensure security, stream ciphers are implemented on hardware due to their speed and simplicity. Amongst different stream ciphers, the eSTREAM ciphers stand due to their frugal implementations. This work probes the effect of unrolling on the efficiency of eSTREAM ciphers, including Trivium, Grain (Grain 80 and Grain 128) and MICKEY (MICKEY 2.0 and MICKEY-128 2.0). It addresses the question of optimal unrolling for designing high-performance stream ciphers. The increase in the area consumption is also bench-marked. The analysis is conducted to identify efficient design principles for ciphers. We experimentally show that the resulting performance after unrolling may disagree with the theoretical prediction when the effects of technology library are considered. We report pre-layout synthesis results on 65 and 130 nm ASIC technology as well as synthesis results for Xilinx FPGA platform in support of our claim. Based on our findings, cipher design and implementation suggestions are proposed to aid hardware designers. Furthermore, we explore why and where area-efficiency for these ciphers saturate.
Highlights
The rise of the Internet-of-things applications has increased the demand for low resource devices.To ensure security it is essential to protect the data generated from these devices
Since MICKEY is based on Jump Registers, its unrolling is different from that of Trivium and Grain which are based on feedback shift registers (FSRs)
We provide a simple example from 130 nm technology library, when we move from the basic Trivium implementation to a quadruple-unrolled version
Summary
The rise of the Internet-of-things applications has increased the demand for low resource devices. Ciphers for constrained computing environments) MICKEY [8] and Trivium [9] stream cipher proposals. These ciphers are considered hardware-efficient due to their low cost and high performance [10,11,12]. As the world is getting closer to the paradigm of pervasive computing, high-performance security for all the increased information exchange is becoming more and more challenging. Stream cipher unroll can promise a lightweight solution to performance boost via unrolling With this motivation, we took up the three hardware portfolio eSTREAM ciphers for HDL implementation, along with their modified versions.
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