actually, no. that’s the point of the snowden reveal.
the long passphrase is used to form your crypto keys which relies on a proper random number generator. if the set if random numbers isn’t billions and billions... but thousands... then it’s easily crackable
Without going into detail, from friends in the IT security business: with a lengthy passphrase and a secure application, you’re pretty safe. I wouldn’t trust any of Microsoft’s office applications and etc., but a local Bitcoin wallet is pretty trustworthy if you passphrase protect it with a lengthy passphrase.