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    <p>I'd like to thank everyone that contributed to this question. </p> <p>Here is what I ultimately came up with as an example for how to encrypt/decrypt using a password, that seems consistent between Android 2.2 and 2.3.3.</p> <p>Main Activity:</p> <pre><code>package cc.ndl.testencryption; import android.app.Activity; import android.os.Bundle; import android.widget.TextView; public class main extends Activity { TextView tvOutput; static String out; String TEST_STRING = "abcdefghijklmnopqrstuvwxyz"; static String PASSKEY = "ThePasswordIsPassord"; static byte[] SALT = { 1, 2, 4, 5 }; static int ITERATIONS = 1979; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); tvOutput = (TextView) findViewById(R.id.tvOutput); } @Override public void onResume() { super.onResume(); out = ""; runTest(); tvOutput.setText(out); } private void runTest() { out = "Test string: " + TEST_STRING + "\n"; out += "Passkey: " + PASSKEY + "\n"; try { Crypto crypto = new Crypto(PASSKEY); String encryptedData = crypto.encrypt(TEST_STRING); out += "Encrypted: " + encryptedData + "\n"; out += "Decrypted: " + crypto.decrypt(encryptedData); } catch (Exception e) { out += "Error: " + e.getMessage() + "\n"; e.printStackTrace(); } } } </code></pre> <p>Main Layout:</p> <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent"&gt; &lt;TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:id="@+id/tvOutput" /&gt; &lt;/LinearLayout&gt; </code></pre> <p>Crypto Object:</p> <pre><code>package cc.ndl.testencryption; import java.security.spec.AlgorithmParameterSpec; import java.security.spec.KeySpec; import javax.crypto.Cipher; import javax.crypto.SecretKey; import javax.crypto.SecretKeyFactory; import javax.crypto.spec.PBEKeySpec; import javax.crypto.spec.PBEParameterSpec; public class Crypto { Cipher ecipher; Cipher dcipher; // 8-byte Salt byte[] salt = { 1, 2, 4, 5, 7, 8, 3, 6 }; // Iteration count int iterationCount = 1979; Crypto(String passPhrase) { try { // Create the key KeySpec keySpec = new PBEKeySpec(passPhrase.toCharArray(), salt, iterationCount); SecretKey key = SecretKeyFactory.getInstance( "PBEWITHSHA256AND128BITAES-CBC-BC").generateSecret(keySpec); ecipher = Cipher.getInstance(key.getAlgorithm()); dcipher = Cipher.getInstance(key.getAlgorithm()); // Prepare the parameter to the ciphers AlgorithmParameterSpec paramSpec = new PBEParameterSpec(salt, iterationCount); // Create the ciphers ecipher.init(Cipher.ENCRYPT_MODE, key, paramSpec); dcipher.init(Cipher.DECRYPT_MODE, key, paramSpec); } catch (Exception e) { } } public String encrypt(String str) { String rVal; try { // Encode the string into bytes using utf-8 byte[] utf8 = str.getBytes("UTF8"); // Encrypt byte[] enc = ecipher.doFinal(utf8); // Encode bytes to base64 to get a string rVal = toHex(enc); } catch (Exception e) { rVal = "Error encrypting: " + e.getMessage(); } return rVal; } public String decrypt(String str) { String rVal; try { // Decode base64 to get bytes byte[] dec = toByte(str); // Decrypt byte[] utf8 = dcipher.doFinal(dec); // Decode using utf-8 rVal = new String(utf8, "UTF8"); } catch (Exception e) { rVal = "Error encrypting: " + e.getMessage(); } return rVal; } private static byte[] toByte(String hexString) { int len = hexString.length() / 2; byte[] result = new byte[len]; for (int i = 0; i &lt; len; i++) result[i] = Integer.valueOf(hexString.substring(2 * i, 2 * i + 2), 16).byteValue(); return result; } private static String toHex(byte[] buf) { if (buf == null) return ""; StringBuffer result = new StringBuffer(2 * buf.length); for (int i = 0; i &lt; buf.length; i++) { appendHex(result, buf[i]); } return result.toString(); } private final static String HEX = "0123456789ABCDEF"; private static void appendHex(StringBuffer sb, byte b) { sb.append(HEX.charAt((b &gt;&gt; 4) &amp; 0x0f)).append(HEX.charAt(b &amp; 0x0f)); } } </code></pre>
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