University of Twente Student Theses
As of Friday, 8 August 2025, the current Student Theses repository is no longer available for thesis uploads. A new Student Theses repository will be available starting Friday, 15 August 2025.
Comparing Fully and Hybrid Homomorphic Encryption in End-to-End applications
Kuindersma, G. (2025) Comparing Fully and Hybrid Homomorphic Encryption in End-to-End applications.
|
PDF
581kB |
| Abstract: | Fully Homomorphic Encryption (FHE) has been proposed as a solution to use cloud services without providing plaintext data. However, FHE has downsides. One of these is its ciphertext size, which can grow orders of magnitude larger than the plaintext. To reduce this downside, Hybrid Homomorphic Encryption (HHE) has been proposed. HHE combines FHE with a symmetric cipher to reduce the ciphertext size. Although there have been some benchmarks on communication costs in the literature, a theoretical model of HHE communication costs seems to be missing. Such a model would help practitioners to make informed decisions. This paper will provide and verify size formulas of the variables for an FHE and an HHE scheme. These formulas are verified with measurements of variable sizes. Using these formulas, we show that, while in some scenarios HHE compensates for its setup cost after only a few messages. In extreme scenarios, this might take hundreds of messages. |
| Item Type: | Essay (Bachelor) |
| Faculty: | EEMCS: Electrical Engineering, Mathematics and Computer Science |
| Subject: | 54 computer science |
| Programme: | Computer Science BSc (56964) |
| Link to this item: | https://purl.utwente.nl/essays/107397 |
| Export this item as: | BibTeX EndNote HTML Citation Reference Manager |
Show download statistics for this publication
Show download statistics for this publicationRepository Staff Only: item control page