Examples described herein relate to a security management system to secure a container ecosystem. In some examples, the security management system may protect one or more entities such as container management applications, container images, containers, and/or executable applications within the containers. The security management system may make use of digital cryptography to generate digital signatures corresponding to one or more of these entities and verify them during the execution so that any compromised entities can be blocked from execution and the container ecosystem may be safeguarded from any malicious network attacks.