What is a trusted device?
When you try to view or edit your credit card details or other sensitive information in your Microsoft account, you might need to enter a security code first, to make sure that only you can get in to your account.
Security
Today, the Microsoft Security Response Center (MSRC) announced the private preview of <a href="http://www.
Public Key Infrastructure (PKI) is used as a building block to provide key security controls, such as data protection and authentication for organizations.