Continuous Authentication: The future of Identity and Access Management (IAM)

Although vendor-written, this contributed piece does not promote a product or service and has been edited and approved by Network World editors.
Usernames and passwords act as a gateway. Insert another authentication step on top of these credentials and this gateway becomes harder to infiltrate. But once access is gained, how can the device or Web application be certain that the authenticated user is, in fact, the same person throughout the entire session?
For example, you may log in and walk a