code: public static boolean checkCipher(Platform platform, byte[] aMsg, int cipherPos,
  			int cipherCount) {
  		if (cipherCount != 2)
  			return false;
  		
  		boolean result = (platform.getUtils().equals(CipherType.AES3.getSymbol(), 0, aMsg, cipherPos , 4)  &&
  			    platform.getUtils().equals(CipherType.AES1.getSymbol(), 0, aMsg, cipherPos + 1 * 4, 4));
  		
  		return result;
  	}
docs: Legacy Client send 2 Cipher : AES3 and AES1