%A SHI Liang and XU Ming %T DWNAF:A Dynamic Window NAF Scalar Multiplication with Threshold %0 Journal Article %D 2017 %J Computer Science %R 10.11896/j.issn.1002-137X.2017.10.030 %P 159-164 %V 44 %N 10 %U {https://www.jsjkx.com/CN/abstract/article_16685.shtml} %8 2018-12-01 %X In order to improve the safety of the data transmission in underwater acoustic channel,in view of the fact that asymmetric encryption requires high performance of nodes, a dynamic window NAF scalar multiplication with a thre-shold (DWNAF) was proposed for underwater acoustic sensor networks.The method is based on the classic width-ω NAF method through a “threshold” for dynamic control,and it can optimize the pretreatment process and effectively reduce the pre-calculation in scalar multiplication.Experimental results show that under the same pre-calculation,the point-add in DWNAF is only 25% of that in RWNAF.In security,DWNAF adopts the combination of window method,energy balance method and masking method,which can effectively resist the common side channel attacks such as SPA,DPA and its variants RPA and ZPA.