# HTML <keygen> Tag

## Example

A form with a keygen field:

<form action="demo_keygen.asp" method="get">
Username: <input type="text" name="usr_name">
Encryption: <keygen name="security">
<input type="submit">
</form>
Try it yourself »

## Definition and Usage

The <keygen> tag specifies a key-pair generator field used for forms.

When the form is submitted, the private key is stored locally, and the public key is sent to the server.

## Browser Support

The numbers in the table specify the first browser version that fully supports the element.

Element |  |  |  |  |
--- | --- | --- | --- | --- | ---
<keygen> | 1.0 | Not supported | 1.0 | 1.2 | 3.0

## Differences Between HTML 4.01 and HTML5

The <keygen> element is new in HTML5.

## Attributes

= New in HTML5.

Attribute | Value | Description
--- | --- | ---
autofocus | autofocus | Specifies that a <keygen> element should automatically get focus when the page loads
challenge | challenge | Specifies that the value of the <keygen> element should be challenged when submitted
disabled | disabled | Specifies that a <keygen> element should be disabled
form | form_id | Specifies one or more forms the <keygen> element belongs to
keytype | rsa dsa ec | Specifies the security algorithm of the key
name | name | Defines a name for the <keygen> element

## Global Attributes

The <keygen> tag also supports the Global Attributes in HTML.

## Event Attributes

The <keygen> tag also supports the Event Attributes in HTML.

## Related Pages

HTML DOM reference: Keygen Object

## Default CSS Settings

None.

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