This repository contains the implementation of the MACAO framework to appear in NDSS'20. This project is built on CodeLite IDE. It is recommended to install CodeLite to load the full MACAO workspace.

• 2020/02/21: Version 1.0 released

1. NTL v9.10.0

2. ZeroMQ

3. Tomcrypt

All MACAO Framework configurations are located in MACAO/config.h.

In MACAO/config.h, enable either the macro #define CORAM_LAYOUT to use Circuit-ORAM eviction principle, or macro #define TRIPLET_EVICTION to use triplet eviction principle

In MACAO/config.h, enable the macros #define XOR_PIR and #define RSSS (and disable #define SPDZ) to use XOR-PIR for retrieval, and replicated sercret sharing scheme (RSSS)'s multiplication for eviction.

Enable macro #define RSSS (and disable #define SPDZ and #define XOR_PIR) to use RSSS for both retrieval and eviction.

Enable macro #define SPDZ (and disable #define RSSS and #define XOR_PIR) to use SPDZ for both retrieval and eviction.

Enable macro #define SEEDING to use PRF to generate additive shares locally in each server machine.

 #define BLOCK_SIZE 128 -> Data block size (in bytes) #define HEIGHT 4 -> Height of MACAO Tree structure static const unsigned long long P = 1073742353; -> Prime field (size should be equal to the defined TYPE_DATA) #define NUM_SERVERS 3 -> Number of servers \ell (only change this if using SPDZ) const std::string SERVER_ADDR[NUM_SERVERS] -> Server IP addresses #define SERVER_PORT 5555 -> Define the first port for incremental to generate other ports for client-server / server-server communications const TYPE_DATA GLOBAL_MAC_KEY -> Define global MAC key const TYPE_DATA MAC_KEY[NUM_SERVERS] -> Define shares of global MAC key (sum of shares_mac_key = global MAC key) static string CLIENT_SERVER_SEED[NUM_SERVERS] -> seed being shared between the cliet and each server for additive secret share generation by PRF static string SERVER_SERVER_SEED[NUM_SERVER][NUM_SERVERS] -> seed being shared between the servers for additive secret share generation by PRF (used in RSSS) 

Goto folder MACAO/ and execute

make 

, which produces the binary executable file named MACAO in MACAO/Debug/.

All necessary data by the client setup phase are output to the MACAO/data folder (by default, which can be changed by editing the config.h under PATHS section). WE refer to MACAO/data.zip as an example of the structure of the folder.

Run the binary executable file MACAO, which will ask for either Client or Server mode. The MACAO implementation can be tested using either single machine or multiple machines:

1. Set SERVER_ADDR in MACAO/config.h to localhost.
2. Set SERVER_PORT
3. Compile the code with make in the MACAO/ folder.
4. Go to MACAO/Debug and run the compiled MACAO file in different Terminals, each playing the client/server role.

1. Set SERVER_ADDR in MACAO/config.h to the real IP address of each server machine.
2. Copy the binary file MACAO compiled under the same configuration to running machines.
3. For first time usage, run the MACAO/Debug/MACAO file on the client machine to initialize the MACAO structure first.
4. Copy the folder the data generated in MACAO/data/xxx/ to corresponding server
5. For each server, run the compiled file MACAO and select the server role (option 2) and the corresponding ID i.

If the paper and the code is found useful, we would be appreciated if our paper can be cited with the following bibtex format

@inproceedings{hoang20:MACAO, author = {Hoang, Thang and Guajardo, Jorge and Yavuz, Attila A.}, title = {MACAO: A Maliciously-Secure and Client-Efficient Active ORAM Framework}, year = {2020}, issue_date = {February 2020}, url = {https://doi.org/10.14722/ndss.2020.24313}, doi = {10.14722/ndss.2020.24313}, booktitle = {Network and Distributed Systems Security (NDSS) Symposium 2020}, } 

For any inquiries, bugs, and assistance on building and running the code, please contact me at hoangm@mail.usf.edu.