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copied!<p>You could pass your file writing stream thru a <code>CipherOutputStream</code></p> <p>Generate a random string, or number or anything. get its byte array, produce a key, and use it to encrypt your file.</p> <pre><code> byte password[] = (WHAT YOUR WANT. STRING, NUMBER, etc.).getBytes(); DESKeySpec desKeySpec; try { desKeySpec = new DESKeySpec(password); SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES"); SecretKey key = keyFactory.generateSecret(desKeySpec); Cipher desCipher = Cipher.getInstance("DES/ECB/PKCS5Padding"); desCipher.init(Cipher.ENCRYPT_MODE, key); // Create stream FileOutputStream fos = new FileOutputStream("Your file here"); BufferedOutputStream bos = new BufferedOutputStream(fos); CipherOutputStream cos = new CipherOutputStream(bos, desCipher); } </code></pre> <p>Now you can write to the file using <code>cos</code></p> <p>Reading the file is done the same way using the <code>SecretKey</code> object</p> <pre><code>SecretKey key = loadKey(); // Deserialize your SecretKey object try { Cipher cipher = Cipher.getInstance("DES/ECB/PKCS5Padding"); cipher.init(Cipher.DECRYPT_MODE, key); FileInputStream fis = new FileInputStream("Your file here"); BufferedInputStream bis = new BufferedInputStream(fis); CipherInputStream cis = new CipherInputStream(bis, cipher); </code></pre> <p>now you can read using <code>cis</code></p> <p>The downside is you need to keep the <code>SecretKey</code> object (Serialize it or something) it wouldn't be a problem for any low level hacker to get the data (since the key is stored on the device) but it wouldn't allow just changing your data using a text editor.</p>

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