Real 10

I've been going at this for about an hour and can't quiet figure out what the heck this encryption is. so here is where i am: i looked at the source in the first page and found a security key then tried the /is directory and found an interesting file /.e***n then i looked at the page it links to and i get that strange encryption but i cant figure out what it is or if it's even relevant to the mission. Can someone give me a little shove in the right direction? Thanks for any help Howie