c# - Service security using lidgren -

i'm doing simple service install in server send , recieve messages between clients of app (not game). service done, lidgren easy , service simple since beginning, i've been searching here , in google how handle security library , i'm totally confused.

take in mind i'm amateur , before trying didn't know authentication , certificates.

so main objective of course server deny connections others app clients, clients deny connections others server.
app have (i suppose) standard login hash , salt bcrypt , check hashed password database (mysql) stored hash. send hash server , check againthe db, don't want since right don't use more after login gc remove asap, therefore don't have anymore after login... , when can solve it, don't want have hash in memory if there're other options.

i began search , read. read certificates secure way authenticate , found several posts here , in google make certificates programmatically. ok, can try that, how work? have make "certificate object", serialize , send connectionapproval message? don't see lidgren have specific this. have generate keys? ssl? isn't webs? httpsbinding? what?

ok, process while researching this. seems i'm unable find "newbie" guide neither not-web network security or lidgren security/authentication, therefore came here.
i'm more willing read articles, blogs, tutorials, whatever, , if possible i'd want stick lidgren since it's easy use , send/recieve message structure have suits need.
any appreciated, , again, i'm more willing read things, including other ways it.