![]() ![]() This is in contrast to the usage counter of Yubico OTPs, which, at 2 bytes in size, can only be incremented 65,535 times before reconfiguration is needed. ![]() This means that even if you were to authenticate 1,000 times every day, it would take 11,767 years before the slot would need to be reconfigured with a new OATH HOTP credential. To generate an HOTP, the YubiKey uses the following elements:Īt 4 bytes, the counter can be incremented up to 4,294,967,295 times (if the counter starts at 0). OATH HOTPs are much simpler than Yubico OTPs. For the average SDK user, we recommend using the OATH application instead of the OTP application for any OATH functionality needs. Providing SDK functionality for OATH within the OTP application is therefore a form of legacy support. So why include OATH functionality in the OTP application if an OATH application exists? Early versions of the YubiKey (YubiKey 1 and 2) only had the OTP application. You may have noticed that the YubiKey also has an OATH application, and the SDK provides the ability to configure the OATH application with both HOTPs and TOTPs (time-based OTPs). The SDK provides the functionality to configure an OTP application slot with an HOTP and control how HOTPs are communicated from a YubiKey to a host device. When an application receives an HOTP during a login attempt, it must send the HOTP to the server, which assesses whether the HOTP is valid and then reports the result to the application. In order to verify the authenticity of HOTPs, a validation server is needed. When an OTP application slot on a YubiKey is configured for OATH HOTP, activating the slot (by touching the YubiKey while plugged into a host device over USB or scanning an NFC-enabled key with an NFC reader) will cause the generation of an HOTP. OATH HOTPs (Initiative for Open Authentication HMAC-based one-time passwords) are 6 or 8 digit unique passcodes that are used as the second factor during two-factor authentication. ![]()
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