Case in point: cryptography, authentication, and authorization are each very sensitive operations which are prone to both gadget attacks and sidechannel attacks

Case in point: cryptography, authentication, and authorization are each very sensitive operations which are prone to both gadget attacks and sidechannel attacks. Sandboxing these operations by creating well-defined boundaries between application code and these algorithms and protocols can ensure that application level bugs cannot creep into these critical services. Consider, for instance, that it is possible to separate TCP/IP or wireless protocol stacks from authentication code so that, for instance, a packet fragmentation bug can't be exploited to influence authentication level decisions. This is classical defense in depth strategy, but enforced through both runtime and formal methods.