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TOTP and HOTP Field Guide: When Your 2FA Stops Needing a Phone
The RFC 6238 test seed is JBSWY3DPEHPK3PXP and the code your phone shows at this…
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The QR Code Is Not the Whole 2FA Setup
A practical guide to comparing TOTP and HOTP codes by making the shared secret, HMAC algorithm, counter, digits, and time window explicit.