[$] Adiantum: encryption for the low end

Low-end devices bound for developing countries, such as those running the Android
Go edition, lack encryption support because the hardware doesn't provide any
cryptographic acceleration. That means users in developing countries have
no protection for the data on their phones. Google would like to change
that situation. The company worked on adding the Speck cipher to the
kernel, but decided against using it
because of opposition due to Speck's origins at the US National
Security Agency (NSA). As a replacement, the Adiantum encryption mode was
developed; it has been merged for Linux 5.0.