Record Narrated Mini-Lessons on a Whiteboard (for Teachers & Tutors)
Record a narrated whiteboard lesson in your browser: draw and talk, replay in sync, export a WebM for Google Classroom or your LMS. Free, no install, no upload.
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Passphrase vs Random Password: Which Is Harder to Crack?
Passphrase vs random password — which is stronger? Compare entropy, diceware word lists, and cracking cost with hard numbers from NIST SP 800-63B and RFC 2289.
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Replace the Meeting: Record a Narrated Whiteboard Walkthrough
Skip the meeting: record a narrated whiteboard walkthrough once and teammates scrub it anytime. Async, private, drawing-native. Export a WebM, no upload.
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Strong Wi-Fi and IoT Device Passwords That Still Type Easily
Generate strong Wi-Fi and IoT device passwords that resist offline cracking yet stay easy to type on phones, smart TVs, and tiny device keypads.
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How to Record a Whiteboard Explainer Video With Your Voice (No Screen Recorder)
Record a whiteboard explainer video with your voice — no screen recorder, no editing, nothing to install. Talk while you draw, then export a WebM. Free, private.
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Detecting Config Drift Between Environments with JSON Diff
Use JSON diff to detect config drift between staging and production. Normalize, exclude noise, and catch drift before deploys break with semantic comparison.
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TOTP vs SMS vs Passkeys: A Threat-Model Comparison
Compare SMS codes, TOTP authenticator apps, and passkeys by threat model: SIM swapping, phishing resistance, origin-binding, and when to use each factor.
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URL-Safe Base64 vs Standard Base64: Key Differences
Standard Base64 uses +, / and = that break URLs, JWTs and filenames. Learn the url safe base64 vs standard base64 difference and how to fix decode errors.
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When Services Use SHA-256 or 8-Digit TOTP
RFC 6238 defaults to SHA-1, 6 digits, 30 seconds. Learn what happens when a service picks SHA-256 or 8-digit codes and why some apps generate wrong codes.
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Catastrophic Backtracking: Spot and Fix ReDoS-Prone Regex
Learn why nested quantifiers cause catastrophic backtracking, how ReDoS attacks freeze servers, and concrete techniques to detect and rewrite vulnerable regex.
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Why My 2FA Code Is Not Working: A Troubleshooting Guide
Your TOTP code rejected? The fixes ordered by likelihood: clock skew first, then wrong algorithm, digits, period, mistyped secret, and reused codes.
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Regex Lookahead and Lookbehind: Practical Examples
Master regex lookahead and lookbehind with clear, testable examples — password rules, thousands separators, masking, and the gotchas that trip people up.
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