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    <p><a href="http://android-developers.blogspot.in/2013/02/using-cryptography-to-store-credentials.html" rel="noreferrer">http://android-developers.blogspot.in/2013/02/using-cryptography-to-store-credentials.html</a></p> <p><a href="http://developer.android.com/reference/javax/crypto/SecretKeyFactory.html" rel="noreferrer">http://developer.android.com/reference/javax/crypto/SecretKeyFactory.html</a></p> <p>Check the above links. Use the below for reference.Modify the below according to your needs. </p> <p>Usage</p> <pre><code> try { DescEncrypter ec = new DescEncrypter(); byte[] cipherText =ec.encrypt("hi", "hello"); String enc = new String(cipherText,"UTF-8"); String decryp= ec.decrypt("hi", cipherText); } catch (UnsupportedEncodingException e) { e.printStackTrace(); } </code></pre> <p>DescEncrypter.java</p> <pre><code> import javax.crypto.Cipher; import javax.crypto.SecretKey; import javax.crypto.SecretKeyFactory; import javax.crypto.spec.IvParameterSpec; import javax.crypto.spec.PBEKeySpec; import javax.crypto.spec.SecretKeySpec; public class DescEncrypter { public static final int SALT_LENGTH = 20; public static final int PBE_ITERATION_COUNT = 200; //1024; private static final String PBE_ALGORITHM = "PBEWithSHA256And256BitAES-CBC-BC"; //algoritmo / modo / relleno private static final String CIPHER_ALGORITHM = "AES/CBC/PKCS5Padding"; byte[] iv = "1234567890asdfgh".getBytes(); byte[] salt = "dfghjklpoiuytgftgyhj".getBytes(); public byte[] encrypt(String password, String cleartext) { byte[] encryptedText = null; try { PBEKeySpec pbeKeySpec = new PBEKeySpec(password.toCharArray(), salt, PBE_ITERATION_COUNT, 256); //Factoria para crear la SecretKey, debemos indicar el Algoritmo SecretKeyFactory factory = SecretKeyFactory.getInstance(PBE_ALGORITHM); SecretKey tmp = factory.generateSecret(pbeKeySpec); //Creamos una llave; SecretKey secret = new SecretKeySpec(tmp.getEncoded(), "AES"); //Obtenemos la llave, solo informativo byte[] key = secret.getEncoded(); //La clase Cipher, se usa para cifrar mediante algoritmos de clave simétrica Cipher encryptionCipher = Cipher.getInstance(CIPHER_ALGORITHM); //byte[] iv = generateIv(); IvParameterSpec ivspec = new IvParameterSpec(iv); //Accion, SecretKey, parameter specification for an initialization vector encryptionCipher.init(Cipher.ENCRYPT_MODE, secret, ivspec); //Realizamos el cifrado encryptedText = encryptionCipher.doFinal(cleartext.getBytes()); } catch (Exception e) { e.printStackTrace(); } return encryptedText; } public String decrypt(String password, byte[] encryptedText) { String cleartext = ""; try { PBEKeySpec pbeKeySpec = new PBEKeySpec(password.toCharArray(), salt, PBE_ITERATION_COUNT, 256); //Factoria para crear la SecretKey, debemos indicar el Algoritmo SecretKeyFactory factory = SecretKeyFactory.getInstance(PBE_ALGORITHM); SecretKey tmp = factory.generateSecret(pbeKeySpec); //Creamos una llave; SecretKey secret = new SecretKeySpec(tmp.getEncoded(), "AES"); //Obtenemos la llave, solo informativo byte[] key = secret.getEncoded(); //La clase Cipher, se usa para cifrar mediante algoritmos de clave simétrica Cipher decryptionCipher = Cipher.getInstance(CIPHER_ALGORITHM); //byte[] iv = generateIv(); IvParameterSpec ivspec = new IvParameterSpec(iv); //Accion, SecretKey, parameter specification for an initialization vector decryptionCipher.init(Cipher.DECRYPT_MODE, secret, ivspec); //Realizamos el descifrado byte[] decryptedText = decryptionCipher.doFinal(encryptedText); cleartext = new String(decryptedText); } catch (Exception e) { e.printStackTrace(); } return cleartext; } } </code></pre>
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    1. COAlthough infinitely better than the posters code, I don't see any requirement to use a password?
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    2. COit was a copy paste from one of the codes. so din't change while copy pasting
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