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In the case of Gmail, once the user’s credentials are verified, the user touches the Yubikey for 2 nd factor. #Yubico authenticator registration#Once the registration is complete, the user can then use the authenticator as the 2 nd factor. This method requires the user to register the authenticator (e.g., Yubikey) with the application (e.g., Gmail) first, during which a key pair is generated by the authenticator, and the public key is sent and stored on the application. FIDO U2FįIDO U2F or U2F for short, mitigates MITM. In the case of Okta, the secrets can be uploaded directly into Okta and validation happens within Okta. When a service receives an OTP, it reaches out to Yubico for validation. Yubikey OTP integrates with a large number of services (e.g., Gmail, LastPass). However, the new secret has to be uploaded to Yubico’s validation servers ( ) otherwise OTP will stop working. Yubico provides a tool that allows you to re-program the key, giving it a different secret. E.g., A fake site impersonating a legitimate site can trick the user into entering the OTP and subsequently forwards it to the real site.Īll Yubikey’s by default have manufacture assigned secrets registered with Yubico’s own validation servers. However, it is also the weakest, as it does not mitigate against MITM attacks. ![]() #Yubico authenticator password#OTP is probably the simplest, with a one-time password being used, typically as the 2 nd factor. As far as authentication goes, it supports a list of the following mechanisms.Įach of the above-mentioned protocols has its own set of requirements and is therefore not universally supported everywhere. ![]() #Yubico authenticator code#Note that this specific demo and code is not affiliated with Yubico.The Yubikey ( ) supports three major functions, authentication, signing and encryption. Valid period in secondsĮxamples Without parameters this live authenticator demo with the source code here. The period parameter defines a validity period in seconds for the TOTP code. The counter parameter is required when provisioning HOTP credentials. The counter is only used if the type is HOTP. The number of digits in a one-time password (OTP). The hash algorithm used by the credential. Also, the issuer parameter and issuer string in label should be equal. The issuer parameter is recommended, but it can be absent. Valid values corresponding to the label examples above would be: issuer=Example The issuer parameter is a string value indicating the provider or service the credential is associated with. There is Base32 helper class in the Yubico.Core library. The padding specified in RFC 3548 section 2.2 is not required and should be omitted. ![]() The secret parameter is an arbitrary credential value encoded in Base32 according to RFC 3548. The secret is provided by the website to the user in the QR code, both sides need to retain this secret key for one-time password generation. According to RFC 5234 a valid label might look like: Secret Neither issuer nor account name may themselves contain a colon. The issuer and account name should be separated by a literal or url-encoded colon, and optional spaces may precede the account name. The label prevents collisions between different accounts with different providers that might be identified using the same account name, e.g. It can be absent.Ī URI-encoded string that usually is the user's email address. It also serves as the unique identifier for the credential itself.Ī string value indicating the provider or service this account is associated with. The label is used to identify which account a credential is associated with. Read more about the difference between the two types of OATH credentials. The type is needed to distinguish whether the credential will be used for counter-based HOTP or for time-based TOTP. #Yubico authenticator how to#Most authenticator apps register a handler for otpauth:// so the camera app knows how to prompt the user to launch the authenticator app when it’s scanned. The otpauth:// URI scheme was originally formalised by Google. This scheme name is used by Authenticator apps to URI string format otpauth://TYPE/LABEL?PARAMETERSĮach URI begins with a scheme name that refers to a specification for assigning identifiers within that scheme. ![]()
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