A PIN is also useless without the user device because it will not work without the associated TPM.Įnabling passwordless sign-in on Windows 10 devices is the latest initiative by Microsoft in an industry-wide effort to encourage the use of two-factor authentication and to end the world’s reliance on passwords that are easily compromised and typically re-used across multiple accounts, enabling credential stuffing attacks. A PIN, in contrast, is “user-provided entropy” (randomness) that is stored on a device in a trusted platform module (TPM), and therefore immune to compromise in the same way as passwords. Passwords are symmetric keys that have to be stored on a server, and if that server is compromised, so is the password. Microsoft argues that while a PIN may seem very much like a password, it is much more secure. “Enabling passwordless sign-in will switch all Microsoft accounts on your Windows 10 device to modern authentication,” the company said in a blog post.
The next major update of the Windows operating system in 2020 will allow users to enable passwordless sign-in and choose whether to use Windows Hello face authentication, fingerprints, or a personal identification number (PIN) to access Microsoft accounts.
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