Hello All,
Thank you for your responses. This is the list I have compiled so far,
my apologies if I have missed a response.
Aspect Security http://www.aspectsecurity.com/
ApplicCure http://www.applicure.com/
Compass Security (Swiss) http://www.csnc.ch/en/
Cybertrust (Verizon) http://www.cybertrust.com/
Deloitte & Touche http://www.deloitte.com
Depth Security http://www.depthsecurity.com/
Ernst & Young http://www.ey.com/
Fortrex Technologies http:/www.fortrex.com
Foundstone http://www.foundstone.com/us/index.asp
GNU Citizen http://gnucitizen.com/
Gotham Digital Science http://www.gdssecurity.com/
IOActive http://www.ioactive.com/
ISEC Auditors (Spain) http://www.isecauditors.com/eng/index.html
Korelogic http://www.korelogic.com/
Matasano http://www.matasano.com/log/mtso/
Neohapsis http://www.neohapsis.com/
NGS Software http://www.ngssoftware.com/
NTObjectives http://www.ntobjectives.com/
SecuRisk Solutions http://www.securisksolutions.com/
Spidynamics (HP)
https://h10078.www1.hp.com/cda/hpms/display/main/hpms_content.jsp?zn=bto&cp=1-11-201_4000_100__
Whitehat Security http://www.whitehatsec.com/home/index.html
Zion Security (Belgium) http://www.zionsecurity.com/
I haven't rank them and I believe it would be difficult to do so. Aspect has
been recommended a few times, NGS Software is owned by David Litchfield who
I've known since the mid-90's. Each vendor probably employs a well-respected
webapp pentester, and I'm sure each engagement will have a different experience.
I believe a pentester is an important addition to a security toolkit.
Bill Stout
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