However, there are special cases in which it is reasonable to require high entropy messages. For example, encryption schemes that encrypt only secret key material (e.g., key encapsulation or Key Wrap schemes) can be considered under an entropic security definition.
On the other hand, there are instances where it makes sense to necessitate high-entropy messages. To illustrate, cryptographic techniques that encrypt solely secret-key materials (such as key encapsulation or Key Wrap algorithms) fall under the purview of an entropic security paradigm.