基于滤波器方法主动吸收式数值水槽研究

基于开源程序OpenFOAM,采用动边界法进行造波,通过求解N-S方程建立二维粘性数值波浪水槽.针对二次反射波,采用频域滤波器方法进行吸收,综合考虑理论传递函数及实际造波需要,确定了目标水深下合适的滤波器参数.通过固定位置输出动边界开发了主动吸收式造波边界,以造波板上理论波面和实测波面为输入信号,根据差分方程得到造波板...     

生态美学与城市道路的融合——以文昌湖旅游度假区湖湾路为例

近年来,随着国民生活水平的日益提高、生态环保意识的显著增强,旅游业的发展已经愈发多元和精致。旅游区道路设计日益成为现代城市风景区的重要一环。如何将旅游区道路赋予生命,将动态、三维空间变成景观,将单调线条赋予韵律和曼妙。以文昌湖旅游度假区湖湾路为例,对旅游区城市道路设计进行探讨。     

Differential fault analysis and meet-in-the-middle attack on the block cipher KATAN32

We investigate the lightweight block cipher KATAN family which consists of three variants with 32, 48 and 64-bit block sizes, called KATAN32, KATAN48 and KATAN64 respectively. However, three variants all have the same key length of 80 bits. On the basis of the bit-oriented faulty model and the differential analysis principle, we describe the attack that combines differential fault attack with the meet-in-the-middle (MITM) attack on the KATAN32. More precisely, inducing a fault at a bit, we can recover some linear differential fault equations on the key bits. During solving equations, without the help of computer, we need only algebraic deduction to obtain relations of some key bits. The complexity in this process is neglectable. The secret key of the full cipher can be recovered faster than exhaustive search for all three block sizes in the KATAN family. Our result describes that KATAN32 is vulnerable.