Dear Sergey,
There is no need to have been involved in free software projects before GSoC, but we do hope for people that can demonstrate that they are able to program and will succeed with (realistic and useful) goals. Regardless, you should have this discussion with Jeff on the gnunet-developer mailinglist (
address@hidden). There, you should try to explain what your technical background is, what you'd like to do and hopefully develop a good project proposal. Naturally, there isn't much time left now, but I think it could still be done. And if not, maybe next year!