homomorpheR

homomorpheR is a package for privacy-preserving statistics across sites that never share their data. It uses fully homomorphic encryption through the openfhe.R interface to OpenFHE — CKKS for real-valued arithmetic, BFV and BGV for exact integers — with n-of-n threshold key generation so that no single party can decrypt. On top of these it ships master/worker primitives that let ordinary R modeling code — stats4::mle(), stratified survival::coxph(), convex programs via CVXR — run across sites. A frozen implementation of the Paillier additive scheme is kept for backward compatibility.

Install released version from CRAN as usual, and development versions via

remotes::install_github("bnaras/homomorpheR")

The cox and cvxr vignettes also use survival and CVXR, which are suggested rather than imported:

install.packages(c("survival", "CVXR"))

The vignettes build up from a gentle introduction to complete distributed protocols:

Getting started

• introduction — a quick tour of homomorphic computation in R.
• precision — which encrypted computations are exact and which are approximate.
• privacy-preserving-aggregation — exact integer aggregation under BFV.
• query-count-threshold — a count across sites under threshold keys.
• mle — homomorphic maximum-likelihood estimation for a Poisson parameter.

Distributed statistical modeling under FHE

• cox — stratified Cox regression distributed across sites under CKKS.
• cox-threshold — the same fit under n-of-n threshold key generation, so no single party can decrypt.
• cvxr-cox-lasso-dlbcl — a Cox-lasso fit by consensus ADMM, with CVXR at each site, under threshold FHE on the DLBCL gene-expression data.
• secure-inference — two-party encrypted prediction.
• encrypted-regression — logistic regression on encrypted data via a Chebyshev sigmoid approximation.
• similarity — federated cosine-similarity retrieval with site-private fine-tuned models.

Gaussian-noise variants

• cox-threshold-dp, cvxr-consensus-admm-dp — the threshold-FHE protocols above with site-side Gaussian noise. Demonstrations, not a privacy guarantee.

Legacy Paillier vignettes. These no longer ship with the package. They are kept in the paillier-archive/ directory of this repository.

• homomorphing — Paillier homomorphic computations.
• DHCox — distributed Cox regression via Paillier.
• QueryNCP — query count with non-cooperating parties.
• DHCoxNCP — distributed Cox with non-cooperating parties.

A related project is distcomp.

Website

You can view everything, including documentation and vignettes on the homomorpheR website.