http://books.google.com/books?q=Network+scanning

http://books.google.com/books?q=packet+encryption&lr=&sa=N&start=10

http://books.google.com/books?lr=&q=SSH+SSL+

 http://books.google.com/books?lr=&q=encrypted+proxy

http://books.google.com/books?lr=&q=intrusion+detection+prevention&btnG=Search+Books