Re: PPRuNe Security...
As an IT professional, I should point out that the biggest risk [if you are keen to keep your identity private] is using a PC at work.
Many companies channel all internet traffic through a pooled connection and many record ALL web access i.e. what sites, pages etc etc. and also WHAT pc etc the access came from.
Whilst that may not be enough to nail down who exactly is the guilty party, in parts of the worlds and/or organisations that will be enough for someone to have their collar felt.
So if you are going to post to PPrune and are at all worried about your employer ascertaining your identity, then I would strongly suggest that you DO NOT use a work pc, but use your own at home or in a internet cafe etc.
[I realise this advice may be self-evident but many people don't realise that corporate web access is often tracked in detail].