This repository contains the code for SparseWPIR, a partition based Weakly-Private Information Retrieval scheme (WPIR) which supports both a classical Keyword PIR scheme (based on Sparse-MulPIR) and a WPIR scheme based on partition. This repository is part of my master thesis project at EPFL and Armasuisse CYD campus called "P3LI5: Enabling Practical Privacy-Preserving Lawful Interception in 5G Core with Lattice-Based Weakly Private Information Retrieval". Check P3LI5 for more reference on the project.

This branch contains an implementation of SparseWPIR used for private Lawful Interception PoC in 5G Core. The code is used in deployment inside a Docker container and is part of the P3LI5 project: P3LI5

• vanilla contains an implementation of SparseWPIR "as-is", without the extra code needed for it to run inside P3LI5. It contains also a test-suite used for benchmarking/demostration of usage.
• indexed_pir contains an implementation of the WPIR scheme for indexed database (so classical PIR setting). Contains a test-suite, and various experiment results.

run pir --help to see how to use the binary. DISCLAIMER: the binary relies on some configuration parameters and environment variables which are normally set automatically during Docker deployment. Please look at P3LI5 /lea and /icf and related DockerFile for more information.

./help.sh to spawn documentation on your browser.

Before running, set the following:

export PKG_CONFIG_PATH=<path_to>/pir/pkg-config/python3-embed.pc
export PYASN_DIR=<path_to>/pir/server
export PIR_LOG=<path_to>/pir/var/log/pir.log

We already provide the Go bindings for GRPC. This is how they were generated (for reference):

• Install protoc:

$ go install google.golang.org/protobuf/cmd/[email protected]
$ go install google.golang.org/grpc/cmd/[email protected]

• Update PATH:

$ export PATH="$PATH:$(go env GOPATH)/bin"

• Run protoc:

protoc --go_out=./client --go_opt=paths=source_relative --go-grpc_out=./client --go-grpc_opt=paths=source_relative ./client/client.proto

rename the client/client folder into client/pb

• Download Go v19.3.1 here:

wget -c -q https://golang.org/dl/go1.19.3.linux-amd64.tar.gz

• Set export PKG_CONFIG_PATH=<path_to>/pir/pkg-config/python3-embed.pc/
• go build inside /pir