Why are dynamic encryption keys preferred over static keys?

Dynamic encryption keys are preferred primarily because they provide stronger security compared to static keys. The fundamental reason for this is that dynamic keys are generated and changed frequently, which makes it significantly more difficult for attackers to compromise the encryption. If a static key is exposed, it can be used to decrypt all past and future communications secured by that key until it is changed. In contrast, dynamic keys, being short-lived, reduce the window of opportunity for an attacker to exploit any potential leaks.

This approach also mitigates risks associated with key compromise. In scenarios where keys are static, the same key might be in use for a prolonged period, increasing vulnerability. By employing dynamic keys, systems can implement key rotation and regular updates, making it challenging for unauthorized entities to decrypt the data even if they manage to obtain the key at some point.

While aspects like manageability, latency, and cost do play roles in the overall architecture and infrastructure choices, the primary advantage of dynamic keys is their contribution to the robustness of encryption mechanisms and the enhancement of overall security posture.