Yeah, you might want to change that. (not that i think anyone would probably be able to guess that. Sometimes simple is the way to go haha)
BUT!! Hello isn't your encryption key! Its your pass PHRASE. The router takes your passphrase and converts that to the type of encryption you picked.
For example, in 32 bit wep encryption Hello would be converted to
"48:81:ed:9f:y8" (BTW that was completely random...)
However, if the "hacker" uses the linksys setup utility he could generate keys with a common passphrase you might choose.