If the user sets a PIN, password, or pattern on the device, and configures Secure Startup via Settings > Biometrics and Security, the Primary Key is re-encrypted by the Keymaster using the user’s credentials and stored. This component uses keys derived from a default password and a device-unique hardware based key to protect against offline attacks. When the user boots up the device for the first time (for example, following a factory reset), the 256-bit Primary Key is randomly generated and encrypted in storage by the TEE-based Keymaster component. Once a device is encrypted, all data created by the user is automatically encrypted before being committed to disk and decrypted during the read process.
#SECOND GALAXY ENCRYPTED DATA ANDROID#
On FDE-based Android devices, all user data is encrypted using AES-256-XTS or AES-256-CBC (depending on the device) with a randomly generated encryption key, also known as the Primary Key. To meet industry and government security requirements, Samsung Knox builds upon FDE to enhance the Android Open Source Project (AOSP) implementation, taking advantage of hardware security mechanisms and the Trusted Execution Environment (TEE) on Samsung Galaxy devices. For devices launching with Android 7.0 or higher, the User Data partition is encrypted by default. What is full-disk encryption (FDE)?įDE was introduced in Android 4.4 to provide users with the option to encrypt the entire User Data partition at the Flash Block level. Per Google Android Compatibility Program’s requirements, devices launched with Android 10.0 or higher are required to use file-based encryption.
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