Hi and welcome here Guillaume,
the background you bring with you here just sounds really promising.
If you are interested in kernel security, you may also have a look to the KSecDD driver
which also provides security components at kernel mode level. You can find some
information in the paper the NIST wrote.
Anyway, let's directly jump to your questions:
Finally, few questions : What should I do to propose
in a formal way my
proposal to RoS community ?
When sending your application for GSoC, you can either
choose a subject from the ReactOS Foundation and purpose a new one. At that time, feel
free to do so. Just ensure your project is "realistic" and that someone may
mentor it.
The best way to ensure that is to join us on ReactOS IRC channel (#reactos //
#reactos-dev) on Freenode to discuss that point.
Is it an obligation to have already send some patches
or can we begin development as a new contributor ?
Regarding GSoC, AFAIK, everyone
can send an application.
On the other hand, if you want to become a regular ReactOS dev, then you first have to
send several patches.
Who can I contact to speak about technical details ?
Well, there are several people you may contact. Regarding GSoC itself, and all the
procedures, you might contact our GSoC administrator: Ged Murphy.
Regarding security in kernel mode, and more specifically Se* package, you might contact
Eric Kohl, a dev who is working on it.
Finally, if you want to discuss about the ReactOS kernel or whatever else but in French,
don't hesitate to summon me ;-).
Regards,
P. Schweitzer