So the best password cracking tool (John the Ripper) is being set up to try and crack 1Password keychains. Not to worry [1Password has our back][1p].
There is way more technical detail than I can get in to here. Go read the post on how 1Password (and a strong Master Password) makes sure you’re totally safe from any brute force crack attempt. If you haven’t read all the other posts they link to on security then read those as well.
If you don’t own 1Password, stop being an idiot and buy it ([AppStore][app]).
[1p]: http://blog.agilebits.com/2012/07/31/1password-is-ready-for-john-the-ripper/ “1Password is ready for John the Ripper”
[app]: http://click.linksynergy.com/fs-bin/stat?id=ov53b8ogfCc&offerid=146261&type=3&subid=0&tmpid=1826&RD_PARM1=http%253A%252F%252Fitunes.apple.com%252Fus%252Fapp%252F1password-password-manager%252Fid443987910%253Fmt%253D12%2526uo%253D4%2526partnerId%253D30 “1Password for Mac on the AppStore”