Sebastian is the CTO & co-founder of Castle. In his role at Castle he's been working closely with companies across different industries to identify and implement strategies for fraud and abuse.
Open Bullet 2 is an open-source software, specialized in credential stuffing attacks, i.e. attacks that use bots to automatically steal user accounts at scale by automatically testing stolen credentia...
Every day, your computer renders dozens of these without you even noticing. Strange patterns, colorful shapes, and emojis—what do you think these are? These are canvas fingerprints, a technique used...
In this article, we cover the details of a heavily distributed credential-stuffing attack that targeted a major US financial service company (spoiler: there were some pretty clear signs of device spoo...
Our mission at Castle is to equip you with the most effective tool to detect and stop bad actors within your application. In the majority of cases, stopping these bad actors is not a one time effort,...
Are your users annoyed by constantly being hit with CAPTCHAs? Find out what how you can improve the user experience while keeping your site secure...
What does the zero-trust security model look like when it’s applied to online fraud and abuse? In this post, I’ll delve into how concepts from zero-trust can be used to fight fraud and abuse with higher accuracy and less user frustration....
Policies lets you create tailored rules that suit your specific needs. It’s designed to work in various scenarios, whether you're dealing with account abuse, account takeovers, or combating SMS-pumping...