What is Multi-Factor Authentication (MFA)?

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…

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What Is the OWASP Top 10?

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),…

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Why Are Passwords Hashed Instead of Encrypted?

A complete, beginner-to-production walkthrough of why every well-built login system stores password hashes instead of encrypted passwords: the 1962 MIT CTSS printer incident, Robert Morris Sr.’s 1970s Unix crypt-with-salt scheme, and the timeline through bcrypt (1999), PBKDF2 (2000), scrypt (2009), and Argon2id’s 2015 Password Hashing Competition win; the core motivation…

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What Is Cross-Site Request Forgery (CSRF)?

A complete, beginner-to-production guide to Cross-Site Request Forgery (CSRF): the bank-tab origin story, Peter Watkins coining the term around 2001, and the timeline from Netscape’s 1994 cookie introduction through the 2006-2007 Netflix, YouTube, and Gmail disclosures to today’s SameSite-by-default browsers; the confused-deputy problem separating authentication from intent; ten core concepts…

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