In
recent years, the study of lightweight symmetric ciphers has gained
interest due to the increasing demand for security services in
constrained computing environments, such as in the Internet of Things.
However, when there are several algorithms to choose from and different
implementation criteria and conditions, it becomes hard to select the
most adequate security primitive for a specific application. This paper
discusses the hardware implementations of Present, a standardized
lightweight cipher called to overcome part of the security issues in
extremely constrained environments. The most representative realizations
of this cipher are reviewed and two novel designs are presented. Using
the same implementation conditions, the two new proposals and three
state-of-the-art designs are evaluated and compared, using area,
performance, energy, and efficiency as metrics. From this wide
experimental evaluation, to the best of our knowledge, new records are
obtained in terms of implementation size and energy consumption. In
particular, our designs result to be adequate in regards to
energy-per-bit and throughput-per-slice.
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