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3 posts
Length beats symbols: measuring password strength in bits
Why a password that passes every uppercase-digit-symbol rule can still be weak, how to measure strength as entropy, passphrases, what NIST now recommends, and why a second factor matters more.
Why a torn QR code still scans: structure and error correction
What a QR code's corner squares, timing patterns and format info do, how version and error-correction level set its size, why a logo still scans, and checking links first.
Finding a meeting time across Seoul, Tokyo, London and New York
Why some city pairs have no shared working hours, how daylight saving moves the overlap twice a year, and a quick way to check.
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