What is a MultiPassword private key?
MultiPassword password manager's primary goal is to securely encrypt and store passwords. To do so, we use modern algorithms: AES-256, HKDF, PBKDF2, and RSA.
The first and primary security guarantee MultiPassword offers is the master password. It's used for authorization and to get access to logins and passwords.
The second important security step is the private key in the format XXXXXXX-XXXX-XXXX-XXXX assigned to every MultiPassword user. This unique private key is created when you register. It's required to authorize new devices in MultiPassword. First, enter the master password, then the private key. No need to remember it; just write it down or save it in a notepad.
You CANNOT authorize a new device (smartphone, PC, laptop, etc.) in MultiPassword without the master password and private key.
After you enter the master password, the private key lets MultiPassword know that the user wants to authorize a new device, smartphone, tablet, or PC. After successfully checking them, all passwords will automatically sync with all devices.
You can change the master password and private key at any time. After that, all authorized devices will be reset. To re-authorize, you'll need to enter the new private key on all devices.