Tom Kranz, a security engineer at Pivotal, discusses whether containers can be secured in a Platform as a Service (PaaS). He emphasizes that security depends on context and implementation rather than features alone. Kranz outlines evaluating risk based on potential attackers, attack vectors, and data at risk to design a secure Pivotal Cloud Foundry implementation. Container isolation through technologies like Warden and Garden can help mitigate attacks by restricting access and network traffic, though apps themselves must also be developed securely. Overall, containers add security benefits to a PaaS but do not eliminate all risk.