Private-ID

Private-ID is a collection of algorithms to match records between two parties, while preserving the privacy of these records. We present two algorithms to do this---one of which does an outer join between parties and another does a inner join and then generates additive shares that can then be input to a Multi Party Compute system like CrypTen. Please refer to our paper for more details.

Build

Private-ID is implemented in Rust to take advantage of the languages security features and to leverage the encryption libraries that we depend on. It should compile with the nightly Rust toolchain.

The following should build and run the unit tests for the building blocks used by the protocols

• cargo build, cargo test

Each protocol involves two parties and they have to be run in its own shell environment. We call one party Company and another party Partner.

Run the script at etc/example/generate_cert.sh to generate dummy_certs directroy if you want to test protocol with tls on local.

Private-ID

This protocol maps the email addresses from both parties to a single ID spine, so that same e-mail addresses map to the same key.

To run Company

env RUST_LOG=info cargo run --bin private-id-server -- \
--host 0.0.0.0:10009 \
--input etc/example/email_company.csv \
--stdout \
--tls-dir etc/example/dummy_certs

To run Partner

env RUST_LOG=info cargo run --bin private-id-client -- \
--company localhost:10009 \
--input etc/example/email_partner.csv \
--stdout \
--tls-dir etc/example/dummy_certs

Private-ID MultiKey

We extend the Private-ID protocol to match multiple identifiers. Please refer to our paper for more details.

To run Company

env RUST_LOG=info cargo run --bin private-id-multi-key-server -- \
    --host 0.0.0.0:10009 \
    --input etc/example/private_id_multi_key/Ex1_company.csv \
    --stdout \
    --tls-dir etc/example/dummy_certs

To run Partner

env RUST_LOG=info cargo run --bin private-id-multi-key-client -- \
     --company localhost:10009 \
     --input etc/example/private_id_multi_key/Ex1_partner.csv \
     --stdout \
     --tls-dir etc/example/dummy_certs

PS3I

This protocol does an inner join based on email addresses as keys and then generates additive share of a feature associated with that email address. The shares are generated in the designated output files as 64 bit numbers

To run Company

env RUST_LOG=info cargo run --bin cross-psi-server -- \
--host 0.0.0.0:10010 \
--input etc/example/input_company.csv \
--output etc/example/output_company.csv \
--no-tls

To run Partner

env RUST_LOG=info cargo run --bin cross-psi-client -- \
--company localhost:10010 \
--input etc/example/input_partner.csv \
--output etc/example/output_partner.csv \
--no-tls

PS3I XOR

This protocol does an inner join based on email addresses as keys and then generates XOR share of a feature associated with that email address. The shares are generated in the designated output files as 64 bit numbers

To run Company

env RUST_LOG=info cargo run --bin cross-psi-xor-server -- \
--host 0.0.0.0:10010 \
--input etc/example/cross_psi_xor/input_company.csv \
--output etc/example/cross_psi_xor/output_company \
--no-tls

To run Partner

env RUST_LOG=info cargo run --bin cross-psi-xor-client -- \
--company localhost:10010 \
--input etc/example/cross_psi_xor/input_partner.csv \
--output etc/example/cross_psi_xor/output_partner \
--no-tls

The --output option provides prefix for the output files that contain the shares. In this case, Company generates two files; output_company_company_feature.csv and output_company_partner_feature.csv. They contain Company's share of company and parter features respectively. Similarly Partner generates two files; output_partner_company_feature.csv and output_partner_company_feature.csv. They contain Partner's share of company and partner features respectively.

Thus output_company_company_feature.csv and output_partner_company_feature.csv are XOR shares of Company's features. Similarly output_partner_company_feature.csv and output_partner_partner_feature.csv are XOR shares of Partner's features.

Private Join and Compute

This is an implementation of Google's Private Join and Compute protocol, that does a inner join based on email addresses and computes a sum of the corresponding feature for the Partner.

env RUST_LOG=info cargo run --bin pjc-client -- \
--company localhost:10011 \
--input etc/example/pjc_partner.csv \
--stdout \
--tls-dir etc/example/dummy_certs

env RUST_LOG=info cargo run --bin pjc-server -- \
--host 0.0.0.0:10011 \
--input etc/example/pjc_company.csv \
--stdout \
--tls-dir etc/example/dummy_certs

SUMID

This is an implmentation of 2-party version of Secure Universal ID protocol. This can work on multiple keys. In the current implementation, the merger party also assumes the role of one data party and the sharer party assumes the role of all the other data parties. The data parties are the .csv files show below

To run merger

env RUST_LOG=info cargo run --bin suid-create-server -- \
        --host 0.0.0.0:10010 \
        --input etc/example/suid/Example1/DataParty2_input.csv \
        --stdout \
        --tls-dir etc/example/dummy_certs

To run merger

env RUST_LOG=info cargo run --bin suid-create-client -- \
     --merger localhost:10010 \
     --input etc/example/suid/Example1/DataParty1_input.csv \
     --input etc/example/suid/Example1/DataParty3_input.csv \
     --stdout \
     --tls-dir etc/example/dummy_certs

The output will be ElGamal encrypted Universal IDs assigned to each entry in the .csv file

License

Private-ID is Apache 2.0 licensed, as found in the LICENSE file

Additional Resources on Private Computation at Meta

• The Value of Secure Multi-Party Computation
• Building the Next Era of Personalized Experiences
• Privacy-Enhancing Technologies and Building for the Future