Homomorphic encryption allows computation on ciphertext. Instead of decrypting to work on the data, you run operations directly on the encrypted form. The output, once decrypted, matches the result as if you had worked on plain text. No exposure. No leak.
User-config-dependent homomorphic encryption adds a layer of context control. The encryption parameters are tied to the configuration choices the user sets. Key generation, polynomial modulus size, or specific encoding schemes can hinge on those settings. A different user config means a different encryption environment. This makes generic attacks harder because the computational space shifts per user-defined rule.
In practice, it impacts performance, interoperability, and deployment workflow. Configuration-dependent schemes require precise mapping between the encryption library settings and the application’s logic paths. If a user changes the config — for instance, toggling between integer and floating-point encodings — functions that operate on encrypted data must adapt instantly. Code brittle to config changes will fail, either at compile time or worse, at runtime.