Easy Learn
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 beginner-to-production guide to SQL injection — the trust-boundary flaw that has sat on the OWASP Top 10 for two decades. Covers the single-quote break-out and login-bypass mechanics; the family tree of in-band, blind, out-of-band, and second-order attacks; why parse-then-bind (prepared statements) fixes it categorically; ten defense layers used in…
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 ground-up tour of transaction isolation — the “I” in ACID — from the joint-account race condition, through dirty reads, non-repeatable reads, phantom reads, lost updates, and write skew; the four SQL isolation levels (Read Uncommitted, Read Committed, Repeatable Read, Serializable) and what each one trades away for speed; pessimistic…
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 complete, beginner-to-production guide to Apache Kafka: what problem it solves, how brokers, topics, partitions, consumer groups, KRaft, and replication actually work under the hood, real Java + Spring Boot code, inline SVG diagrams, and lessons from Netflix, Uber, LinkedIn, Airbnb, and Walmart.
The Least Recently Used (LRU) cache eviction policy is one of the oldest, simplest, and most trusted ideas in computer science: when a fixed-size cache runs out of space, throw away whichever item has gone the longest without being touched. Under that one-line rule sits a surprisingly deep piece of…