基于Zheng签密和SK签密的改进方案

近年来针对孤立目标的微动特征提取技术已较为成熟,但针对群目标的分辨与微动特征提取技术尚有待深入研究。以空间自旋微动群目标为例,提出了一种基于正弦调频傅里叶变换的自旋微动群目标分辨方法。建立了自旋微动群目标的回波模型,在此基础上采用正弦调频傅里叶变换来提取回波中的微多普勒特征分量。针对正弦调频傅里叶变换在分析多分量正弦调频信号时所特有的交叉项问题,提出了一种有效的交叉项抑制方法。结合交叉项抑制方法,利用正弦调频傅里叶变换处理自旋群目标微动信号,实现了对自旋微动群目标的分辨,并准确地提取出各子目标自旋频率特征。

Improving methods of signcryption based on Zheng and SK

Signcryption is a cryptographic technique that combined signature with encryption then achieved into one logical process in the same time, which efficiency is much higher than the traditional methods which sign first and encrypt second and has became a research hotspot in communication area. This paper analyzes the security and efficiency level of Zhang signcryption scheme and SK signcryption scheme, aiming at its two deficiencies which are lack of forward security and public verifiability, we came up with a new improved method by the principle of using signcryption information and open information can restore the information that unsigncryption need and using one-way function, bilinear pairings and identity-based cryptosystem and other technical. Based on the analysis of authentication, the improved scheme is improved on the efficiency and safety.