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private void changeName() throws Exception {
    File inFile = new File(torrentFilePath);
    File outFile = new File(torrentFilePath + Hashes.getRandom(6));
    BufferedInputStream inStream = new BufferedInputStream(new FileInputStream(inFile));
    BufferedOutputStream outStream = new BufferedOutputStream(new FileOutputStream(outFile));

    int bytesRead;
    int totalBytesRead = 0;
    byte[] bytes = new byte[1024];
    String inString = "";

    while((bytesRead = inStream.read(bytes)) > 0) {
        inString += new String(bytes, 0, bytesRead);
        totalBytesRead += bytesRead;
    }
    inStream.close();
    int len = inString.length();
    int idx = inString.indexOf(NAME_TAG);
    int lastidx = inString.indexOf(objectName) + objectName.length();

    outStream.write(bytes, 0, idx + NAME_TAG.length());
    outStream.write(new String(objectKey.length() + ":" + objectKey).getBytes());
    outStream.write(bytes, lastidx, totalBytesRead - lastidx);

    outStream.close();
    outFile.renameTo(inFile);
}