All data is fraudulent. All communications are attempted hacks.
All clients are thieves.
The minute you connect your computer to the Internet is the minute that the security of your data has been compromised. As was proven by Kevin Mitnick in the celebrated cracking of the San Diego Supercomputer Center in 1994, even seasoned security veterans like Tsutomu Shimamura can be cracked. The sad fact is that crackers will always have the upper hand. Time, persistence, creativity, the complexity of software and the server environment, and the ignorance of the common user are their weapons. And of course, system administrators are only human.