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    copied!<p>I suggest you to use java-applet. This approach is unified for all browsers. We use it in our projects. To sign the user-data you will need to use JCA API (<a href="http://download.oracle.com/javase/1.4.2/docs/guide/security/CryptoSpec.html#Signature">http://download.oracle.com/javase/1.4.2/docs/guide/security/CryptoSpec.html#Signature</a>). Also you will need to solve problem with accessing windows certificate store from java. </p> <p>You can solve it in this way:</p> <pre><code>KeyStore keystore = KeyStore.getInstance("Windows-MY", "SunMSCAPI"); keystore.load(null, null); HashMap&lt;String,String&gt; userPublicKeys = new HashMap&lt;String,String&gt;(); Enumeration&lt;String&gt; aliasesEnum = keystore.aliases(); if (!aliasesEnum.hasMoreElements()) throw new Exception("No certificate!"); // list through windows personal store while (aliasesEnum.hasMoreElements()) { String alias = aliasesEnum.nextElement(); boolean isKey = keystore.isKeyEntry(alias); if (isKey) { BASE64Encoder encoder = new BASE64Encoder(); encoder.encode(keystore.getCertificate(alias).getEncoded()); userPublicKeys.put(alias, encoder.encode(keystore.getCertificate(alias).getEncoded())); System.out.println("Entry alias: " + alias); } // sign PrivateKey privateKey = (PrivateKey) keystore.getKey(alias,null); Provider provider = keystore.getProvider(); // data to signed byte[] data ="test data".getBytes(); // Signing the data Signature sig = Signature.getInstance("SHA1withRSA", provider); sig.initSign(privateKey); sig.update(data); byte[] signature = sig.sign(); System.out.println(ByteArrayToFromHexDigits.bytesToHexString(signature).toUpperCase()); } </code></pre>
 

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