Updated version of EPPB now fully supports new iCloud backup encryption introduced in iOS 7.1, including 3rd party app data (such as WhatsApp, Skype, Viber etc). Besides, some runtime errors have been eliminated.
Get more information on EPPB or download free trial version
http://www.elcomsoft.com/eppb.html
Try Elcomsoft Phone Password Breaker:
http://www.elcomsoft.com/download/eppb_setup_en.msi