How to resolve bug RC4 encrypt-decrypt on iPAD with AIR15 only

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Hi everybody,
I have some trouble with AIR15 only, In the past, I created a small game on 
iPad It could send or receive messge from server. I used lib as3crypto.swc 
encrypt or decrypt message (RC4). But when I upgrade to AIR15 encrypt-decrypt 
cannot work ( Another thing about this crash is that it only happens with a 
release (adhoc or appstore) build but NOT with a debug build). I check so many 
time but i don't know what is problem here.
Please help me, thanks so much any advice.

Class RC4.as

import com.hurlant.crypto.prng.ARC4;
import com.hurlant.util.Base64;
import com.hurlant.util.Hex;
import flash.utils.ByteArray;

public class RC4
{
  private static const key:String = "keytest";
  private static var byteKeys:ByteArray = Hex.toArray(Hex.fromString(key));
  private static var rc4:ARC4 = new ARC4();

  public static function encrypt(clearText:String):String
{
  var byteText:ByteArray = Hex.toArray(Hex.fromString(clearText));
  rc4.init(byteKeys);
  rc4.encrypt(byteText);
  return Base64.encodeByteArray(byteText);
}
public static function decrypt(encryptedText:String):String
{
  var byteText:ByteArray = Base64.decodeToByteArray(encryptedText);
  rc4.init(byteKeys);
  rc4.decrypt(byteText);
  return Hex.toString(Hex.fromArray(byteText));
}
}

Original issue reported on code.google.com by hoangsan...@gmail.com on 31 Oct 2014 at 8:35