Adaptive hybrid encryption and secret mixing in resource-and-bandwidth-constrained systems

The main objective of this paper is a general formulation of an adaptive cryptosystem based on Maurer's idea of constructive cryptography. Our adaptive framework is constructed in the context of hybrid encryption adapted to three varying factors, which are the maximum data flow between the transmit-receive parties, the computational complexity, and the level of security required for each of them. Based on these factors, the adaptive system will select the most appropriate encryption scheme from four proposed models, which are traditional hybrid encryption, hybrid encryption with secret mixing of key, hybrid encryption with secret mixing of message, and hybrid encryption with secret mixing of both key and message. We explain the four models in detail, giving a comparison and analysis together with some implementation results as a guideline on how our adaptive system can make its choices.