La '''Offensive Security''' (abbreviata in '''OffSec''') è una multinazionale [[Stati Uniti|americana]] che si occupa di [[sicurezza informatica]], [[Penetration test|test di penetrazione]] e di [[Digital forensics|forensica digitale]].
Fondata nel 2007 da Mati "muts" Aharoni, la OffSec è responsabile della creazione e dello sviluppo di diversi progetti [[open source]] quali il database di [[Exploit|vulnerabilità informatiche]] ''ExploitDb'' e la [[Distribuzione Linux|distro]] [[Kali Linux]] (nota in precedenza come [[Backtrack]]).
La compagnia fornisce [[Consulenza informatica|consulenze]] a svariate aziende tech di primissimo piano quali [[Accenture]], [[Amazon Web Services]]
,<ref name=":0">{{cite web|url=https://www.offensive-security.com/|website=Offensive Security|accessdate=26 September 2015|ref=The only provider of true performance-based penetration testing training and ethical hacking courses for over 8 years.|title=Homepage}}</ref>
the company created [[open source]] projects, advanced security courses, ExploitDB ([[Vulnerability database]]) and the [[Kali Linux|Kali]] [[Linux distribution]]. The company was started by Mati Aharoni<ref>{{cite web|url=https://www.offensive-security.com/about-us/|website=Offensive Security|accessdate=26 September 2015|title=About Us}}</ref>, and employs security professionals with experience in security [[penetration testing]] and system security evaluation. The company has provided security counseling and training to the many technology companies.<ref>{{cite journal|last=Kirk|first=Jeremy|date=Jul 29, 2014|title=Zero-day flaws found in Symantec's Endpoint Protection|url=https://www.pcworld.com/article/2459540/zeroday-flaws-found-in-symantecs-endpoint-protection.html|journal=PC World|volume=|pages=|accessdate=26 September 2015|ref=A very public example of such assistance|via=}}</ref>
The company also provides training courses and certifications.
