It's one thing when cybersecurity hackers bring your system down. At least you can tell what's going on. But what about when malicious people inside or outside alter or erase data quietly? It's a major worry for business and government not knowing what they don't know. That's why the National Cybersecurity Center of Excellence has launched a project to establish standards and best practices for knowing about and responding to attacks on data integrity. For more on this project, Federal Drive with Tom Temin talked to Nate Lesser, the center's deputy director.