Web/API/PublicKeyCredentialCreationOptions/attestation

Secure contextThis feature is available only in secure contexts (HTTPS), in some or all supporting browsers.

attestation is an optional property of the PublicKeyCredentialCreationOptions dictionary. This is a string whose value indicates the preference regarding the attestation transport, between the authenticator, the client and the relying party.

The attestation is a mean for the relying party to verify the origin of the authenticator with an attestation certificate authority. The information contained in the attestation may thus disclose some information about the user (e.g. which device they are using).

Syntax

attestation = publicKeyCredentialCreationOptions.attestation

Value

A string which may be

"none": the relying party is not interested in this attestation. This avoids making a check with the attestation certificate authority and asking the user consent for sharing identifying information.
"indirect": the client may change the assertion from the authenticator (for instance, using an anonymization CA). This value is used when the relying party wishes to verify the attestation.
"direct": the relying party wants to receive the attestation as generated by the authenticator.

The default value is "none".

Examples

var publicKey = {
  attestation: "indirect",
  challenge: new Uint8Array(26) /* this actually is given from the server */,
  rp: {
    name: "Example CORP",
    id  : "login.example.com"
  },
  user: {
    id: new Uint8Array(26), /* To be changed for each user */
    name: "[email protected]",
    displayName: "John Doe",
  },
  pubKeyCredParams: [
    {
      type: "public-key",
      alg: -7
    }
  ]
};

navigator.credentials.create({ publicKey })
  .then(function (newCredentialInfo) {
    // send attestation response and client extensions
    // to the server to proceed with the registration
    // of the credential
  }).catch(function (err) {
     console.error(err);
  });

Specifications

Specification	Status	Comment
Web Authentication: An API for accessing Public Key Credentials Level 1The definition of 'attestation' in that specification.	Recommendation	Initial definition.

Browser compatibility

Update compatibility data on GitHub

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
`attestation` Experimental'	Chrome Full support 67	Edge Full support ≤79	Firefox Full support 60	IE No support No	Opera Full support 54	Safari Full support 13	WebView Android No support No	Chrome Android Full support 67	Firefox Android ?	Opera Android Full support 48	Safari iOS Full support 13.3	Samsung Internet Android No support No

Legend

Full support: Full support
No support: No support
Compatibility unknown: Compatibility unknown
Experimental. Expect behavior to change in the future.': Experimental. Expect behavior to change in the future.