Try to avoid using shared computers
Security permissions on a shared computer may not have been appropriately configured. For example, it may be possible for any other user of the computer to overcome the permissions, giving access to each other's files.
Only use computers that have been configured securely
When you are working at home, try to use a computer that is exclusively for your own use. Use an operating system that has been, or that you have, configured with security in mind, and is regularly updated.
Here is more information about how to configure devices and computers securely.