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    <p>This problem is bound to occur in a multi threaded environment, as it happened to me. The issue is a clash between mCipher.init() and mCipher.doFinal() methods.</p> <p>Following are the related methods in Cipher class:</p> <pre><code>public final void init(int opmode, Key key, AlgorithmParameterSpec params) throws InvalidKeyException, InvalidAlgorithmParameterException { init(opmode, key, params, JceSecurity.RANDOM); } public final void init(int opmode, Key key, AlgorithmParameterSpec params, SecureRandom random) throws InvalidKeyException, InvalidAlgorithmParameterException { initialized = false; checkOpmode(opmode); if (spi != null) { checkCryptoPerm(spi, key, params); spi.engineInit(opmode, key, params, random); } else { chooseProvider(I_PARAMSPEC, opmode, key, params, null, random); } initialized = true; this.opmode = opmode; } public final int doFinal(byte[] output, int outputOffset) throws IllegalBlockSizeException, ShortBufferException, BadPaddingException { checkCipherState(); // Input sanity check if ((output == null) || (outputOffset &lt; 0)) { throw new IllegalArgumentException("Bad arguments"); } chooseFirstProvider(); return spi.engineDoFinal(null, 0, 0, output, outputOffset); } private void checkCipherState() { if (!(this instanceof NullCipher)) { if (!initialized) { throw new IllegalStateException("Cipher not initialized"); } if ((opmode != Cipher.ENCRYPT_MODE) &amp;&amp; (opmode != Cipher.DECRYPT_MODE)) { throw new IllegalStateException("Cipher not initialized " + "for encryption/decryption"); } } } </code></pre> <p>See the behavior of the <code>initialized</code> variable in a multi threaded environment with two threads executing init() and doFinal(). The Exception returned is not related to the object not being actually initialized but the <code>initialized</code> variable being set to <code>false</code>.</p> <p>I solved my issue by synchronizing my encryptString() and decryptString() methods. Hope you can get some insight by going through the Cipher code.</p>
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