## about this topic

Information security has stopped being a specialist topic and become every developer’s responsibility: a single vulnerability can cost the data of millions of users. This hub holds the CodeCrush articles on security: the fundamentals of cryptography, authentication and authorisation, the most common vulnerabilities in web applications, API protection and the practical implications of Brazil’s data-protection law (LGPD) for anyone building software there. The guides show both the defensive side — how to write safer code and architectures — and the context: how attacks work, what social engineering is, and why security has to enter the development cycle from the start rather than as a patch at the end.