In this paper we show how PCA (Principal Component Analysis) method can be implemented using Java programming language. We consider using PCA algorithm especially in analysed data obtained from Raman spectroscopy measurements, but other applications of developed software should also be possible. Our goal is to create a general purpose PCA application, ready to run on every platform which is supported by Java.
This paper deals with some of the WEP (Wired Equivalent Privacy) key decryption methods based on aircrack-ng
software, which was embedded in Backtrack operating system (Linux distribution). The 64-bit (40-bit) and 128-bit (104-
bit) key encrypted with RC4 cipher weakness was shown. Research methods were made in different network
environments. In this work we compared different types of keys to check how strong the RC4 stream cipher can be. The
40-bit and 104-bit WEP key has been tested on IEEE 802.11 based wireless LAN using laptop with live-CD Linux
operating system. A short analysis of key creation methods was performed to compare the amount of time necessary to
decrypt random and nonrandom WEP keys.