Easy Learn
A complete, architect-level guide to firewalls: what a firewall really is (a rule-driven network checkpoint), the seven-stage history from 1980s DEC packet filters through Check Point stateful inspection, proxy/application-layer firewalls, UTM appliances, Palo Alto Networks NGFWs, cloud/software-defined firewalls and WAFs, up to modern Zero Trust and identity-aware architectures; the problems…
A complete beginner-to-production walkthrough of hashing versus encryption: what each one really is, how they work internally (Merkle-Damgard SHA-256, AES-256 block-cipher rounds, RSA key math, hybrid TLS handshake), and exactly where each belongs in real systems. Covers the history from 1950s hash tables through DES, RSA, MD5/SHA-1, AES, SHA-2, SHA-3,…
A beginner-to-production deep dive into input validation: the security-guard-at-the-door analogy for what validation is, a six-milestone history arc from 1960s punch-card format checks through the 1988 Morris Worm buffer overflow, the 1990s-2000s rise of SQL injection/XSS/command injection, the 2003 launch of the OWASP Top 10, the 2009 standardisation of Java…
Role-Based Access Control (RBAC) is the security model where access rights attach to roles instead of individual users, and users gain permissions indirectly by being assigned to one or more roles. It is the default authorization model behind AWS IAM, Kubernetes, Azure RBAC, Google Cloud IAM, Windows Active Directory groups,…
A complete, beginner-to-production guide to the principle of least privilege (PoLP): what it is, why it matters, and how modern operating systems, cloud platforms, databases, APIs, microservices, and even AI agents apply it in practice. Traces the history from Saltzer and Schroeder’s landmark 1975 paper “The Protection of Information in…
A beginner-to-production deep dive into security patches and timely patching: a lock/paperclip analogy for what a patch really is, a six-milestone history arc from 1960s paper-tape patches through Windows/Linux in the 1990s, Code Red and SQL Slammer in the early 2000s, the 2003 launch of Microsoft Patch Tuesday, 2010s regulated…
A ground-up guide to why security is classified as a non-functional requirement rather than a feature: what NFRs really mean, how the ISO/IEC 25010 quality model shapes the classification, what “cross-cutting concern” looks like in real Java code, how it maps onto DevSecOps and microservices, and what real breaches (Equifax,…
A beginner-to-production deep dive into JSON Web Tokens: the amusement-park-wristband analogy for why servers can verify identity without phoning home, a six-milestone historical arc (2010 JOSE drafts, 2012 OAuth 2.0 RFC 6749, 2014 OpenID Connect 1.0, May 2015 RFC 7519 publication alongside RFC 7515 JWS / 7516 JWE / 7517…
A ground-up, beginner-friendly deep dive into how Multi-Factor Authentication actually works under the hood: the front-door-key-and-fingerprint analogy for why one secret is never enough, the six-milestone historical arc from the 1986 RSA SecurID hardware token through HOTP (RFC 4226) and TOTP (RFC 6238) standardization, push-notification MFA, U2F/WebAuthn, and today’s passwordless…
A complete, beginner-to-production guide to the OWASP Top 10 – the world’s most influential web application security standard: what it is (a community-driven, evidence-based ranking of the ten most critical web application security risks), who owns it (the nonprofit Open Worldwide Application Security Project founded in 2001 by Mark Curphey),…