Google announced Adiantum, a new encryption method devised to protect Android devices without cryptographic acceleration.
“Adiantum is an innovation in cryptography designed to make storage encryption more efficient for devices without cryptographic acceleration, to ensure that all devices can be encrypted.” reads the announcement published by Google.
Since Android version 6.0, user data
The new encryption form has been created for devices running Android 9 and higher that doesn’t support AES CPU instructions.
For this reason, Google developed Adiantum that supports the ChaCha stream cipher in a length-preserving mode.
ChaCha allows improving security and performance in the absence of dedicated hardware acceleration.
Google experts pointed out that Adiantum encryption/decryption processes on ARM Cortex-A7 processors are around five times faster compared to AES-256-XTS.
“Unlike modes such as XTS or CBC-ESSIV, Adiantum is a true wide-block mode: changing any bit anywhere in the plaintext will unrecognizably change all of the
Adiantum could represent the optimal solution for a wide range of devices that
“Our hope is that Adiantum will democratize encryption for all devices. Just like you wouldn’t buy a phone without text messaging, there will be no excuse for compromising security for the sake of device performance.”
wrote Eugene Liderman, Director of Mobile Security Strategy, Android Security & Privacy Team, says.
“Everyone should have privacy and security, regardless of their phone’s price tag,”
Google published technical details about the new encryption form in the paper titled “Adiantum: length-preserving encryption for entry-level processors.”