“Know Your Enemy,” said one, just beneath that familiar Microsoft Windows logo.

 

“There’s no place like 127.0.0.1,” said another, recasting Dorothy Gale’s famous mantra with internet speak.

“Stop laughing,” said a third. “Computers are cool now.”

 

Some proclaimed a deep devotion for things like open source software and public key encryption. Some carried rather clever inside jokes that spoke only to other hackers. Some railed against the corporate world. Some insulted the government. And, yes, most of them were black.