Buchwald was a social engineer, with the ability to manipulate phone system employees anywhere in the United States. In addition, he had a hacking skill with regard to Bell and AT&T systems (specifically COSMOS, SCCS, and LMOS), which allowed him virtually unrestricted access to phone lines, including the ability to monitor conversations, throughout the country. He was the lead author of the PENIX suite of hacking tools. Some of his original ideas are still in use by social engineers today.
In 1995, Dave served as a technical consultant to the movie Hackers.
In 1997, Buchwald co-founded Crossbar Security with Mark Abene (a.k.a. Phiber Optik) and Andrew Brown. Crossbar provided information security services for a number of large corporations, but became a casualty of the dot-com bubble. Crossbar went defunct in 2001, largely due to cuts in corporate security spending and an increase in the cost of corporate computer security advertising.
Buchwald works as a film editor and freelance photographer in New York City. He produces cover art for 2600 Magazine. In August 2006, he completed his first feature film, Urchin. He has recently produced and edited the independent film Love Simple and is in pre-production on the film Kuru, the second movie by the production company The Enemy.
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- Scheib, Ronnie (2009-08-26). "Love Simple review". Variety. Retrieved 2008-08-31.