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The Design of a Low-Power Asynchronous DES Coprocessor for Sensor Network Encryption

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5 Author(s)
Yijun Liu ; Fac. of Comput., Guangdong Univ. of Technol., Guangzhou, China ; Pinghua Chen ; Guobo Xie ; Zhusong Liu
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Sensor network nodes have a very tight power budget and the power efficiency is the biggest design concern in sensor network circuits. A general-purpose processor (e.g. an ARM processor) is not efficient to execute encryption algorithms because it has no special instructions to support encryption operations, for example very often-used permutation operations. In the paper, we propose a low-power ASIC encryption coprocessor for sensor network nodes. A DES algorithm is used because the algorithm does not include power-hungry and complex mathematic operations, such as multiplication, division and addition. An asynchronous logic style is used to design the coprocessor. With an asynchronous controller, a global clock is not necessary when idle, resulting in zero standby dynamic power. Using the DES coprocessor, the power consumed by encryption can be saved by 4 orders of magnitude than a pure software calculation.

Published in:

Computer Science and Computational Technology, 2008. ISCSCT '08. International Symposium on  (Volume:2 )

Date of Conference:

20-22 Dec. 2008