Yes, the MSM is full of such things these days. But this topic actually came up in August 2013:
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A senior source at South Africas National Prosecuting Authority said that despite repeated requests, Pistorius could not help them access a programme on his phone called WhatsApp.
He said: There are several encrypted messages on that application of interest to us. But they are coded and even WhatsApps servers cannot identify them.
Oscar says he cannot remember a password for them or what they say.
After months of SDHp pressing him he remembered the password to his iPhone 5 but we havent been in a position to open all his messages from the night of the shooting and the days before that. Detectives are keen to find out who Pistorius was in contact with before and on the night of Reevas death.
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http://www.dailystar.co.uk/news/lat...laims-he-cannot-remember-log-in-for-phone-app
So the issue according to the above at that time was not the pwd to the iphone - it was the pwd to encrypted WhatsApp messages. I'm going to stick with that account until I hear really good evidence to the contrary.