https://blog.cryptographyengineering.com/2012/04/05/icloud-who-holds-key/ https://blog.cryptographyengineering.com/2012/04/05/icloud-w... "The mud puddle test:

https://blog.cryptographyengineering.com/2012/04/05/icloud-who-holds-key/ https://blog.cryptographyengineering.com/2012/04/05/icloud-w... "The mud puddle test: You don’t have to dig through Apple’s ToS to determine how they store their encryption keys. There’s a much simpler approach that I call the ‘mud puddle test’"