In a report from Motherboard (via MacRumors), FBI forensic expert Stephen Flatley lashed out at Apple during the International Conference on Cyber Security in Manhattan, where he basically called them “jerks” and “evil geniuses” for making his work and his colleagues’ work harder due to the encryption of the iPhone.
He also revealed that Apple recently made password guesses through the brute force method a lot harder, by changing the hash iterations from 10,000 to 10,000,000. Flatley was quoted as saying, “Your crack time just went from two days to two months. At what point is it just trying to one up things and at what point is it to thwart law enforcement? Apple is pretty good at evil genius stuff.”
That being said despite Apple’s best attempts, it seems that there has been some success with unlocking encrypted iPhones. Previously it was reported that the FBI had worked with Cellebrite to help them break into an encrypted iPhone.