Hi,

Initially was a closed paper, now I rewritten it a bit. Here a little Abstract:

The principal objective of this paper is to give a good detailed
panoramic view of the Security aspects involved in Client-Server based
Applications. The panoramics will be seen from the point of view of a
Reverse Engineer that should be aware of the Security Problems that are
directly releated to the Client-Server Software Structure.

and here the link:

http://evilcry.netsons.org/tuts/CSAnalysis.pdf

Regards,
Evilcry