How does an OTP token generate a one-time password?

A Time-based OTP (TOTP) token uses a shared secret key and the current timestamp to generate a 6- or 8-digit code via HMAC-SHA1/HMAC-SHA256 (RFC 6238). The server validates the code within a time window (typically ±30 seconds). Excelsecu's OTP tokens are OATH-compliant and available as hardware tokens, display cards, and mobile apps.

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How does an OTP token generate a one-time password?