There are two kinds of cryptography in this world: cryptography that will stop your kid sister from reading your files, and cryptography that will stop major governments from reading your files.

It is insufficient to protect ourselves with laws; we need to protect ourselves with mathematics.

Given the credible estimate that we've spent $1 trillion on anti-terrorism security

And honestly, if anyone thinks they can get an accurate picture of anyplace on the planet by reading news reports, they're sadly mistaken.

The whole notion of passwords is based on an oxymoron. The idea is to have a random string that is easy to remember. Unfortunately, if it's easy to remember, it's something nonrandom like 'Susan.' And if it's random, like 'r7U2*Qnp,' then it's not easy to remember.

The very definition of news is something that hardly ever happens. If an incident is in the news, we shouldn't worry about it. It's when something is so common that its no longer news - car crashes, domestic violence - that we should worry.

I tell people: if it's in the news, don't worry about it, because by definition, news is something that almost never happens.