http://blog.chinaunix.net/uid-20662820-id-4023733.html
http://www.faqs.org/faqs/snmp-faq/part2/
http://www.ibm.com/developerworks/cn/xml/x-dom4j.html
https://www.gnu.org/software/parallel/
Hash碰撞:http://www.win.tue.nl/hashclash/
http://linux.chinaunix.net/techdoc/net/2008/08/21/1026818.shtml