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Practical guides on the tools developers use every day — JSON, regex, JWT, cron, and more.

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August 16, 20265 min read
How TOTP-Based 2FA Actually Works Under the Hood
Time-based one-time passwords are just a shared secret plus the current time, run through HMAC. Here's the whole mechanism.
securityauthentication2fa
August 15, 20265 min read
Why You Can't Just SHA-256 a Password (and What bcrypt Actually Does)
Fast hash functions are the wrong tool for passwords. bcrypt is deliberately slow and salted — here's why that matters.
securityauthenticationbcrypt

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