// Small NEWS // Google Launches Adiantum to Secure Low Cost Android Devices!!
The Adiantum encryption method is almost as secure as the AES but does not require hardware acceleration. A boon for Android Go devices or any connected objects that work with ARM Cortex-A7 chips with low power.
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The security of entry-level Android devices gets ready to take a leap forward. Google has unveiled Adiantum, a data encryption engine that requires little power. At the moment, the maximum level of data security on Android can only be obtained on devices running ARM 8 chips, components that incorporate instructions that speed up AES encryption.
The problem with AES, which is a rather strong method of protecting information, is that data encryption/decryption is slow on ARM Cortex A7 chips that do not incorporate hardware acceleration.
This is where Adiantum comes in, a security system that can work quickly on this type of chips, components that do not just fit the entry-level Android Go smartphones but also many connected objects such as watches. Google promises to secure "the next billion users," referring to its willingness to make Android smartphones (and the rest) accessible to developing countries.
Adiantum dances Chacha
Without going into the (very) technical details of Google's blog post, Adiantum is a solution that the firm knows very well. It relies on an encryption system of flow called "ChaCha20", a mechanism that uses instructions that all processors integrate natively such as additions, rotations... and that Google has integrated the HTTPS protection protocol into its secure transport layer (TLS).
If ChaCha20 is secure enough to protect our web site communications, it was robust enough to encrypt phone data. However, it took the Google engineers to solve some problems related to the use of storage space and the speed of execution, hence the creation of Adiantum.
According to Google's performance metrics, Adiantum encryption/decryption execution speed (whose name comes from a fern that symbolizes "sincerity and discretion") would be x5.5 faster than the AES on a ARM Cortex-A7 processor cadenced at 1.19 GHz. We would thus pass from a reading/writing flow of only 20/24 MB/s in AES to a flow of 112 MB/s. What offer to the entry level smartphones a sufficient level of security, without noticeably reducing the performance.
If it provides an adequate level of security, Google specifies however that "Adiantum only concerns terminals whose speed of processing data encrypted in AES is less than 50 MB/s". The protection system for more powerful terminals based on ARM 8 processors remains on AES, considered by Google as more secure.
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