A5 is a stream cipher. A5 is based on a combination of three linear feedback shift registers (LFSRs) with irregular clocking. It uses 64 bit keys. The register lengths are 19, 22, and 23. All the feedback polynomials are sparse. The output is the XOR

基于稀疏矩阵的低复杂度安全网络编码算法 ：针对安全网络编码复杂度较大的问题，提出一种基于稀疏矩阵的安全网络编码算法。利用稀疏矩阵占用较少的存储空间和运算速 度快的优点，在信源处将信源信息与稀疏矩阵进行矩阵变换操作，使得随机网络编码能以较高的概率达到信息论安全的要求。仿真结果表 明，该算法能提高编解码速率，降低复杂度，减少存储空间。-Low-complexi Secure Network Coding Algorithm Based 0n Sparse M atrix

Compressive sampling is an emerging technique that promises to effectively recover a sparse signal from far fewer measurements than its dimension. The compressive sampling theory assures almost an exact recovery of a sparse signal if the signal is se