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FAQ When I try to encrypt a document using public-key encryption, an InvalidKeyException is thrown, saying the key size is invalid. Why Due to import con-

trol restrictions by the governments of a few countries, the encryption libraries shipped by default with the JDK restrict the length, and as a result the strength, of encryption keys. If you want these examples to work, you need to replace the default JARs with the Java Cryptography Extension (JCE) Unlimited Strength Jurisdiction Policy Files. These JARs are available for download from http://java.sun.com/ in eligible countries. The document was encrypted for Bruno Specimen and for myself. If somebody else tries to open the document, they will get an Acrobat Security error, saying that A digital ID was used to encrypt this document but no digital ID is present to decrypt it. Make sure your digital ID is properly installed or contact the document author. See figure 12.2. Suppose that the document was created for you. In that case, you should use the keytool utility to export the private key from your key store to a .p12 file. To install

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Modifying the client The first step in incorporating socket capabilities in the MsgClient application is to modify the user interface so that the socket behavior that we will be writing can be invoked. This requires two changes. First, we add a menu item to our list of menu choices called Socket Message . This becomes the second option in the list.

your private key on the Windows OS, you need to double-click this file (for instance, private.p12) and follow the instructions.

private static final String[] choices = { "1 HTTP Example", "2 Socket Message" };

The path to my personal key store and certificate, along with the corresponding passwords that are used in the examples, are stored in a properties file on my OS. For obvious reasons, this file is not distributed with the examples.

Next we enhance the handleOK()method to be able to respond appropriately when the Socket Message menu option is chosen.

When you open the document that was created using listing 12.11 and your public key, the PDF will be shown, as in figure 12.3. When you open the Document Properties window, you can check the permissions and the security method that was used. While this is a safer way to protect your document than using user and owner passwords, it s hard to enforce the permissions. Private key holders can always use a PDF library to decrypt the content that was encrypted with their own public key.

In the previous section, you used PdfStamper to decrypt existing password-protected PDF files using the owner password; or to encrypt an unprotected PDF file by adding a user and an owner password. In this listing, you ll do the same with public-key encryption.

private void handleOK(int idx){ display.setCurrent(outputForm); switch (idx) { case 0: getHttpMessage(); break;

public PrivateKey getPrivateKey() throws GeneralSecurityException, IOException { String path = "resources/encryption/.keystore"; KeyStore ks = KeyStore.getInstance(KeyStore.getDefaultType()); Creates ks.load(new FileInputStream(path), PrivateKey "f00b4r".toCharArray()); object PrivateKey pk = (PrivateKey)ks.getKey("foobar", "f1lmf3st".toCharArray()); return pk; } public void decryptPdf(String src, String dest) throws IOException, DocumentException, GeneralSecurityException { PdfReader reader = new PdfReader(src, Creates reader getPublicCertificate( using certificate "resources/encryption/foobar.cer"), and private key getPrivateKey(), "BC"); PdfStamper stamper = new PdfStamper(reader, new FileOutputStream(dest)); stamper.close(); } public void encryptPdf(String src, String dest) throws IOException, DocumentException, CertificateException { PdfReader reader = new PdfReader(src); PdfStamper stamper = new PdfStamper(reader, new FileOutputStream(dest)); Certificate cert = getPublicCertificate("resources/encryption/foobar.cer"); stamper.setEncryption(new Certificate[]{cert}, Sets encryption new int[]{PdfWriter.ALLOW_PRINTING}, using certificates PdfWriter.ENCRYPTION_AES_128); stamper.close(); }

case 1: socketMessage(); break; } }

There is a good chance you will decide to modify a style you created. To do this, you need to access the Modify Style dialog box, as shown in Figure 2-21. In the Styles and Formatting task pane, hold the mouse over the style you would like to modify. Click the arrow that appears and select Modify. The Modify Style dialog box, which is similar to the New Style dialog box, will open.

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