How to quickly crack Apple iWork passwords

The Apple iWork office productivity suite for the Mac has been around for ages, and was recently joined by an iOS version. iWork documents have, up until now, been seen as being pretty safe courtesy of the particular implementation of the 128-bit AES encryption Apple used to secure them. I say up until now as it appears that iWork passwords have been pretty comprehensively broken thanks to the latest in a long line of 'password recovery' applications from Russian outfit Elcomsoft.