PDFCrack is a GNU/Linux application (or any other POSIX -compatible system) tool for recovering passwords and content from PDF -files. It is small, command line driven without external dependencies. PDFCrack is released under GPL . Install and pdfcrack on Ubuntu by typing: cc@zeus:$ sudo aptitude install pdfcrack Run a quick cracking power benchmark: cc@zeus:/Desktop$ pdfcrack -b Benchmark: Average Speed (calls / second): MD5: 1728972.6 MD5_50 (fast): 97879.3 MD5_50 (slow): 69167.0 RC4 (40, static): 606555.

This script shows the Top 10 worst performing indexes (in terms of selectivity %) on the whole MySQL server instance. Selectivity is the percentage of distinct values in an indexed field compared to the number of records in the table. When constructing indexes, you want to create indexes on columns that have a good chance of “high selectivity”. This requires some understanding of the data in the column, which you may or may not have depending on your knowledge of the domain and the availability of sample data.

WEP was intended to provide comparable confidentiality to a traditional wired network (in particular it does not protect users of the network from each other, but from outsiders), hence the name WEP. Despite the intention, several serious weaknesses were identified by cryptanalysts over the last years. The severity of the weaknesses means that any WEP protected network can be cracked using the right software within two minutes or less. WEP was superseded by Wi-Fi Protected Access (also known as WPA) in 2003, and then by the full IEEE 802.