Um amigo meu fez uma pergunta sobre como ele poderia proteger seu laptop ao se conectar a hotspots WiFi públicos. Ele considera a criptografia de arquivos confidenciais uma boa ideia e já fez o download de um bom pacote de criptografia.
Existem utilitários bons que podem monitorar seu adaptador WiFi e avisá-lo quando as tentativas de invasão ocorrerem, bem como bloqueá-las?
O que você está procurando é chamado de Firewall. Existem firewalls básicos incorporados nos sistemas operacionais atuais. Eu vejo algumas perguntas de superusuário que falam sobre aquelas em Windows XP e Windows 7 se você estiver qualquer um desses sistemas operacionais.
Eu sigo a resposta da VPN. Você pode usar um túnel ssh para sua própria rede doméstica e navegar pela rede a partir daí. É muito mais fácil que uma VPN completa. Google "tomato ssh tunnel" e você verá algumas variações. Depois de configurar o putty, há apenas uma alteração para definir em fire fox ou Ie.
Sua melhor aposta é provavelmente a VPN para uma rede remota / segura.
Parece um exagero para um único sistema, mas Snort parece o que você quer, pelo que está dizendo
Melhores pacotes de segurança gratuitos :
Its Defense+ HIPS performance exceeds commercial products and leads the class, it includes an excellent "memory firewall" feature, and it allows you to quickly switch between Defense+ security modes and configurations. Includes automatic updates. Installation can automatically configure your PC to use the Comodo SecureDNS (but you can do this without installing CIS).
It was the heaviest on memory resources of all top picks. The automatic installation mode popups are very annoying and much better handled in Online Armor. It also comes with an optional antivirus that bloats its download size to 3 times the other products. You get 3 pre-checked nags/options during installation. I didn't find Threatcast very active or helpful at all as of yet.
Online Armor Free (a versão comercial é a minha favorita)
Excellent proactive security performance. Includes a "run safer" feature to reduce rights for specific risky applications, a helpful security wizard to minimize popup alerts, and the ability to monitor key logger activity and host files. It handles the installation of new programs better than any other tested product. You can also close its tray icons to save memory and it still functions fully.
It doesn't have automatic updates or a built-in help. It's mandatory to enter an email during installation, and it has a pre-checked option to send it anonymous information. I also noticed an advertisement popup for its commercial product (but I could check to disable them). Windows Vista gave me two security warnings during installation: "Windows can't verify the publisher of this driver software" (details: some OA drivers don't have a valid digital signature it seems, but OA is a safe application to install obviously).
Provides excellent proactive security performance comparable to Comodo. The installation and initial setup is amazingly easy, the popup alert format is fairly simplistic, and the full screen or "game mode" works nicely to prevent popup alerts. Includes default profiles to quickly personalize network rules. Automatically updates.
Doesn't have an installation/training mode, so installing new programs can be frustrating. Some network profiles may not get perfect GRC stealth results, such as "home" for me (but it passed all my other inbound tests). It fails the Zemana key logger test in its default settings (but it passes the test when I disable "automatically allow applications with valid signatures"). Minimal built-in help, and doesn't break active connections. You also get a pre-checked option to install a Spyware Doctor evaluation during installation.