What are the three 3 features of security?

I'm curious, what are the three key features that define security in the world of cryptocurrency and finance? I understand that security is paramount to ensuring trust and protecting users' funds, but I'd like to know more specifically what those defining characteristics are. Are they related to encryption strength, access control measures, or perhaps something else entirely? I'm eager to gain a deeper understanding of these essential security aspects and how they contribute to the overall safety of the cryptocurrency ecosystem.