Oblivious Transfer

Implementation of UC-secure Oblivous Transfer under DDH assumption based on the following work: "A Framework for Efficient and Composable Oblivious Transfer" by Chris Peikert and Vinod Vaikuntanathan and Brent Waters. A demo can be seen on YouTube.

Installation instruction:

• In your home directory type:

$ git clone https://github.com/manel1874/DDHOT.git

• Install libscapi using dev branch: https://github.com/cryptobiu/libscapi/tree/dev. In case it does not compile, please follow the instructions in README_libscapi.md.

• Copy the elements inside UC_DDH_OT to libscapi folder:

$ cd

$ cp -r DDHOT/UC_DDH_OT/. libscapi

• Update your current home directory in the makefile file. (ex. change manel to your username)

• Run:

$ cd ~/libsacpi

$ make -f makefile_UCOT

Run example

• Run in separate terminals:

Terminal 1

$ ./runOT 0 0

Terminal 2

$ ./runOT 1 1

• The first input corresponds to the party type (0: Sender; 1: Receiver);
• For a Sender Party the second input corresponds to the crs setup type (0: Messy mode; 1: Decryption mode);
• For a Receiver Party the second input corresponds to the chosen element, sigma (0: m0, 1: m1).