Definition of "homomorphic"

If it is necessary or desirable to preserve input or output port structure in homomorphic images, one must insist on a special case of homomorphism.

1993, A. Wayne Wymore, Model-Based Systems Engineering, CRC Press, page 182

In this chapter two types of signature schemes satisfying homomorphic properties are presented. In the first section a description of the homomorphic signature schemes suitable in the single-user scenario is provided.

2016, Giulia Traverso, Denise Demirel, Johannes Buchmann, Homomorphic Signature Schemes: A Survey, Springer, page 11