![]() Smart cards contain a chip that brokers data exchanges. It works in Chrome by default and in Firefox (you would need to change a config flag). ![]() It doesn’t require any software or drivers. It is phishing resistant unlike TOTP/Google Authenticator and it is much harder to compromise than SMS/Voice call methods. U2F is the recommended two factor method. It supports up to 32 OATH-TOTP/OATH-HOTP codes, PIV and OpenPGP.Īn open authentication standard enabling strong two-factor authentication to any number of web-based applications, such as Gmail, Salesforce, Amazon Web Services, Twitter and hundreds more services. CCID: This is the interface allowing the key to act as a Smart Card.By default, a Yubico OTP is preconfigured in the first slot. Each one of them can be configured and used as: OATH-HOTP, Yubico OTP, Challenge-Response or Static password. OTP: This interface has 2 slots (short-press and long-press).FIDO: This interface only supports the U2F protocol.Yubico call these USB interfaces and each one of them supports one or multiple modes/protocols. You can read more about this here and here. NOTE: Seems like the YubiKey 4 with firmwares between 4.2.6 and 4.3.4 had a security vulnerability that would allow an attacker to reconstruct the private key using the public key. It’s a USB key (some versions support USB-A, some USB-C and the latest versions even support NFC) with a LED and a button. The YubiKey is a small hardware authentication device, created by Yubico, that supports a wide range of authentication protocols. The only reason I’m using TOTP rather than U2F, is because Amazon Web Services does not support 2 MFA devices attached to the same user, and their AWS CLI does not support U2F yet.īasically, you can use U2F to access the web console, but forget about using U2F when running CLI commands in the terminal (and for me, this is not acceptable). U2F should be used when possible because it is significantly safer than any other alternative.
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