Although not at the very first line, I do expand the acronyms in the first section: > Introduction: TOTP stands for Time-based One-Time Password. At the heart

Although not at the very first line, I do expand the acronyms in the first section: > Introduction: TOTP stands for Time-based One-Time Password. At the heart of the TOTP algorithm lies the HOTP algorithm. HOTP stands for HMAC-based One-Time Password.