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One-time passwords (OTPs) have been used since the 1980s.[citation needed] In 2004, an Open Authentication Reference Architecture for the secure generation of OTPs was announced at the annual RSA Conference.[1][2] The Initiative for Open Authentication (OATH) launched a year later.[citation needed] Two IETF standards grew out of this work, the HMAC-based One-time Password (HOTP) algorithm and the Time-based One-time Password (TOTP) algorithm specified by RFC 4226 and RFC 6238, respectively. By OATH OTP, we mean either HOTP or TOTP. OATH certifies conformance with the HOTP and TOTP standards.[3]