Presentation Title: Spam goes VOIP – Number Harvesting for Fun and Profit
Presentation Details:

Email spam is world wide issue. Sources estimate 80% of email traffic is spam. While ISPs and endusers got accustomed to spam and developed sophisticated countermeasures VoIP spam is an as of now nonexisting problem. SPIT (Spam over IP Telephony) received lots of attention in the media but since the underlying technolgy is different ISPs cannot apply the same filters to protect their networks and users. The talk describes a crucial prerequisite to SPIT in detail, namely Number Harvesting. Number Harvesting is the collection of numbers or strings that represent parties on a VoIP network. Sources for Number Harvesting are revealed and methods to verify and enhance the information gathered will be given. Some live demos round off the presentation.

About Hendrik

Hendrik Scholz is a lead VoIP developer and systems engineer at Freenet Cityline GmbH in Kiel, Germany. While studying and working in Kiel (Germany), Melbourne (Australia), Atlanta (Ga, USA) and Orlando (Fl, USA) he contributed to FreeBSD and specialized on networking security issues. Nowadays the average work day consists of a healthy mix of design, development and debugging. Having access to all sorts of VoIP devices hacking on those became a spare time passion. Publications include various presentations as well as additions to the SIP Express Router (SER, available at iptel.org). Some publications are available at http://www.wormulon.net/publications/