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## HTML `` `keytype` Attribute The `keytype` attribute of the `` element specifies the security algorithm used to generate the key pair. > **Important Deprecation Notice:** The `` element and its attributes (including `keytype`) have been **deprecated** and removed from the HTML standard. Modern web applications should use the secure and robust **Web Cryptography API** (`crypto.subtle`) for key generation and cryptographic operations. --- ## Syntax ```html ``` ### Attribute Values | Value | Description | | :--- | :--- | | **`rsa`** | **Default**. Specifies the RSA (Rivest–Shamir–Adleman) security algorithm. The user can choose the RSA key strength. | | **`dsa`** | Specifies the DSA (Digital Signature Algorithm) security algorithm. The user can choose the DSA key length. | | **`ec`** | Specifies the EC (Elliptic Curve) security algorithm. The user can choose the EC key strength. | --- ## Code Example The following example demonstrates how to use the `keytype` attribute to request an RSA key pair generation within an HTML form: ```html

Username: Encryption:

``` --- ## Browser Support Historically, support for the `` element and the `keytype` attribute varied significantly across browsers: * **Supported (Legacy):** Older versions of Firefox, Opera, and Chrome. * **Unsupported:** Internet Explorer and Safari had limited or no native support. * **Modern Browsers:** All modern browsers (including Chrome, Edge, Firefox, and Safari) have completely removed support for the `` tag due to security concerns and lack of standardization. --- ## Modern Alternative: Web Cryptography API Because `` is obsolete, you should use the **Web Cryptography API** to generate cryptographic keys directly in the browser. Here is a modern JavaScript equivalent for generating an RSA key pair: ```javascript // Generate an RSA-OAEP key pair using the Web Cryptography API window.crypto.subtle.generateKey( { name: "RSA-OAEP", modulusLength: 2048, // Key size: 2048 bits publicExponent: new Uint8Array([1, 0, 1]), // 65537 hash: "SHA-256", }, true, // Whether the key is exportable ["encrypt", "decrypt"] // Key usages ) .then((keyPair) => { console.log("Key pair generated successfully:", keyPair); }) .catch((err) => { console.error("Key generation failed:", err); }); ```