Secretly withdrew the encryption function that Google was functioning by default at Android 5.0, what is the cause?

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Google's latest OS for mobile terminalsAndroid 5.0 LollipopThe official version was released in November 2014. Easy "light environment transition" function and "lock screen notification" function etc.Various new functionsAndroid 5.0 Lollipop added, but it turned out that Google was secretly withdrawing "automatic encryption" function which is one of the new features.

Google quietly backs away from encrypting new Lollipop devices by default [Updated] | Ars Technica
http://arstechnica.com/gadgets/2015/03/google-quietly-backs-away-from-encrypting-new-lollipop-devices-by-default/


It was possible to encrypt the data files in the terminal even on Android 5.0 and earlier models, but in Android 5.0 this feature is on by default, so the user must manually turn on the encryption function There was no. However, some recently released Android 5.0-equipped devices seem to have several encryption features not turned on by default, this is because Google released Android 5.0 Ars Technica points out that it is inconsistent with the statement that Lollipop makes encryption function the standard function ".

"For over three years, Android has provided data encryption functionality, and what matters is that it is impossible to share data with law enforcement authorities, not on what is stored on the terminal "In September 2014, Google's Niki Christoph announced the importance of the new encryption function to The Washington PostAppealThere was.

In addition, in October 2014 GoogleOfficial blogWhen I explained about the security aspect of Android 5.0, "In the next version of Android, encryption is turned on by default, so that encryption has already been done in the state of a new item out of the box It was explained "It will become."

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For a while from the release, the device with Android 5.0 is Google'sNexus 6WhenNexus 9By default, these terminals had encryption turned on by default. However, among the other terminals "Many of the terminals upgraded to Android 5.0 with OS update", the encryption function is not on by default, so it seems that this setting will not change even if the terminal is initialized.

And further, I debuted as a third party terminal equipped with Android 5.0Moto EEven in the initial state, the data encryption function is not turned on. In addition, according to Ars Technica's Ron Amadeo, it was exhibited at Mobile World CongressGalaxy S6The demonstration machine also said that the encryption function was not turned on.


latestAndroid CDDLooking atOEMManufacturers must follow the guidelines "to manufacture Google authorized Android 5.0 terminals". Here, "If the terminal holds the lock screen, the terminal must support complete encryption of the private data of the application as well as the SD card as well as the normal non-removable storage part It is clearly stated that it is necessary to support encryption ", but at the moment it seems that OEM manufacturers are left to decide whether or not to turn on the encryption function.

Ars Technica talks about why encryption is turned on by default,ReviewAs you can see from the fact that Nexus 6 was slower than Nexus 5, the storage read / write speed greatly changes as the encryption function turns on and off.

In fact, media-centered around hardware-related reviewsAnandTechOf the benchmark application of Nexus 6 with the encryption function turned on and offANDEBenchThe result of measuring sequential random read / write performance using the following graph. It is clear that storage performance improves by turning off encryption function.


In addition,EngadgetAccording to the comments made to Google, "Google will continue to be able to continue to use the encryption function in Nexus terminal by default" policy.