That is the event-based Authly/Google Authenticator. The major weakness of this scheme is that it is not resistant to man-in-the-middle attacks. (You can overwrite this with a custom server and verify yourself). It is broadly similar to OATH HOTP, but again, to eliminate provisioning, it, by default, relies on a shared secret installed and held by Yubico and their verification servers. It is a one-way protocol, which means that it can be handled via iOS's read-only NFC support. This is a Yubico proprietary HOTP-like scheme, and relies on a shared secret held by Yubico. The Yubikey can implement multiple schemes. In addition to NFC, the device has a dongle for USB-A connectivity so it can double as an authenticator on laptop and desktop computers, and Yubico says that it's crush resistant and waterproof. The NEO does not require a battery to function, nor does it need network connectivity, and Yubico says that it is "four times faster" than typing a traditional one-time passcode. It has been possible for developers to integrate with YubiKey NEO since iOS 11 launched in September, but the debut of the SDK should lead to wider adoption since it will be far easier for developers to introduce support for the device's NFC abilities. Once set up with a LastPass account, the YubiKey NEO generates a one-time password, and when the user gets to the 2FA log-in screen, they simply tap the NEO near the back of the iPhone to authenticate. With the launch of the YubiKit 1.0.0 iOS SDK, the company is allowing developers to add support for the YubiKey NEO into their iOS apps, starting with sole support from LastPass. With the NFC-equipped YubiKey NEO, Android users have been able to authenticate their log-ins with a tap, and this week Yubico announced that ability has launched for iPhone users as well (via The Next Web). Yubico is a company that sells the "YubiKey," a small piece of hardware that protects access to computers and online accounts by providing strong two-factor authentication in lieu of receiving a text message code on a smartphone or other 2FA steps.
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