Introduction

This folder contains code for Porthos - a semi-honest 3 party secure computation protocol.

Setup

(Ubuntu):

• sudo apt-get install libssl-dev
• sudo apt-get install g++
• sudo apt-get install make

Running the protocol

• To compile use make clean && make -j.
• Currently the codebase contains precompiled code the following 3 neural networks: ResNet-50, DenseNet-121 and SqueezeNet for ImageNet, checked into the following folder: ./src/example_neural_nets. Toggle the flag in ./src/example_neural_nets/network_config.h to switch the network which runs. Note that if there is more than network flag uncommented or if there is already a main file in src, the compilation will error out.
• For example, to run the ResNet-50 code, use the following commands: ./party0.sh < ../Athos/Networks/ResNet/ResNet_img_input.inp ./party1.sh ./party2.sh

Note that the first command makes use of input generated from Athos. Please refer to the Athos readme on how to do the same.

Notes

• If porthosSecretType != uint64_t, porthosSecretType multiplication function won't work.
• Possible instructions for installation of libssl on Mac, though untested.

• brew install libssl
• cd /usr/local/include
• ln -s ../opt/openssl/include/openssl . Also, use the second build command for Mac to be safe. Read the Caveats part of brew install instructions, since Apple has deprecated the use of OpenSSL.

• libmiracl.a is compiled locally, if it does not work try the libmiracl_old.a or download the source files from https://github.com/miracl/MIRACL.git and compile miracl.a yourself (and rename to libmriacl.a when copying into this repo)

• When extracting bits out of __m128i, val[0] corresponds to the LSB. The set functions of __m128i take the first argument as val[0].

• If porthosSecretType != uint64_t, porthosSecretType multiplication function won't work.

• Matrix multiplication assembly code only works for Intel C/C++ compiler. The non-assembly code has correctness issues when both the multiplicands are large uint64_t's