Optimized authentication system for a multiuser device

A user device, comprising:

• a memory;
• a trusted device;
• and
• a processor communicatively coupled to the memory and to the trusted device, wherein:
• the processor is configured to encrypt, based at least in part on utilizing a symmetric key, a folder stored on the user device;
• the processor is configured to encrypt, based at least in part on utilizing an assigned public key specific to the folder, the symmetric key to determine a single-encrypted symmetric key;
• the trusted device is configured to encrypt, based at least in part on utilizing a trusted device key specific to the user device and successful verification of first biometric information, the single-encrypted symmetric key to determine a double-encrypted symmetric key, the trusted device key being generated by the trusted device and being identified by a trusted device key identifier associated with the symmetric key;
• the trusted device is configured to encrypt, based at least in part on utilizing a trusted user key specific to the folder and successful verification of second biometric information, an assigned private key that is associated with the assigned public key to determine an encrypted assigned private key, the trusted user key being generated by the trusted device and being identified by a trusted user key identifier associated with the assigned private key;
• and
• the processor is configured to store the double-encrypted symmetric key and the encrypted assigned private key in memory associated with the user device.

A non-transitory computer-readable medium configured to store instructions, which when executed by a processor or a trusted device associated with a user device, configure:

• the processor to encrypt, based at least in part on utilizing a symmetric key, a folder stored on the user device;
• the processor to encrypt, based at least in part on utilizing an assigned public key specific to the folder, the symmetric key to determine a single-encrypted symmetric key;
• the trusted device to encrypt, based at least in part on utilizing a trusted device key specific to the user device and successful verification of first biometric information, the single-encrypted symmetric key to determine a double-encrypted symmetric key, the trusted device key being generated by the trusted device and being identified by a trusted device key identifier associated with the symmetric key;
• the trusted device to encrypt, based at least in part on utilizing a trusted user key specific to the folder and successful verification of second biometric information, an assigned private key that is associated with the assigned public key to determine an encrypted assigned private key, the trusted user key being generated by the trusted device and being identified by a trusted user key identifier associated with the assigned private key;
• and
• the processor to store the double-encrypted symmetric key and the encrypted assigned private key in memory associated with the user device.