BACKGROUND

As technology has advanced, computing devices have become increasingly commonplace in our lives. For example, many people have mobile devices such as phones or tablets that they carry with them and use throughout the day. While these devices have provided many benefits to our lives, they are not without their problems. One such problem is that oftentimes people keep confidential information or applications on the device they do not want another person to see or have access to. For example, a user may be in a crowded location where other people can see what is displayed on his device when he unlocks it. Some devices do support multiple user accounts, but switching between user accounts can be cumbersome, and some devices (e.g., many mobile phones) do not support multiple user accounts. These difficulties in using their devices can be frustrating for users, resulting in user dissatisfaction with their devices.

