Private-ID

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

Build

Private-ID is implemented in Rust to take advantage of the language's 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 --release
cargo test --release

Each protocol involves two (or more) parties and they have to be run in their own shell environment. We call one party Company and another party Partner. Some protocols also involve additional parties such as the Helper and the Shuffler.

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

Build & Run With Docker Compose

The following, run each party in a different container:

• Private-ID: docker compose --profile private-id up
• Delegated Private Matching for Compute (DPMC): docker compose --profile dpmc up
• Delegated Private Matching for Compute with Secure Shuffling (DSPMC): docker compose --profile dspmc up

By default, this will create datasets of 10 items each. To run with bigger datasets set the ENV_VARIABLE_FOR_SIZE environment variable. For example: ENV_VARIABLE_FOR_SIZE=100 docker compose --profile dpmc up will run DPMC with datasets of 100 items each.

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 --release --bin private-id-server -- \
  --host 0.0.0.0:10009 \
  --input etc/example/email_company.csv \
  --stdout \
  --no-tls

To run Partner:

env RUST_LOG=info cargo run --release --bin private-id-client -- \
  --company localhost:10009 \
  --input etc/example/email_partner.csv \
  --stdout \
  --no-tls

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 --release --bin private-id-multi-key-server -- \
  --host 0.0.0.0:10009 \
  --input etc/example/private_id_multi_key/Ex1_company.csv \
  --stdout \
  --no-tls

To run Partner:

env RUST_LOG=info cargo run --release --bin private-id-multi-key-client -- \
  --company localhost:10009 \
  --input etc/example/private_id_multi_key/Ex1_partner.csv \
  --stdout \
  --no-tls

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 --release --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 --release --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 --release --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 --release --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_partner_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.

To run Company:

env RUST_LOG=info cargo run --release --bin pjc-server -- \
  --host 0.0.0.0:10011 \
  --input etc/example/pjc_company.csv \
  --stdout \
  --no-tls

To run Partner:

env RUST_LOG=info cargo run --release --bin pjc-client -- \
  --company localhost:10011 \
  --input etc/example/pjc_partner.csv \
  --stdout \
  --no-tls

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 --release --bin suid-create-server -- \
  --host 0.0.0.0:10010 \
  --input etc/example/suid/Example1/DataParty2_input.csv \
  --stdout \
  --no-tls

To run client:

env RUST_LOG=info cargo run --release --bin suid-create-client -- \
  --merger localhost:10010 \
  --input etc/example/suid/Example1/DataParty1_input.csv \
  --input etc/example/suid/Example1/DataParty3_input.csv \
  --stdout \
  --no-tls

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

Delegated Private Matching for Compute (DPMC)

We extend the Multi-key Private-ID protocol to multiple partners. Please refer to our paper for more details.

To run Company:

env RUST_LOG=info cargo run --release --bin dpmc-company-server -- \
  --host 0.0.0.0:10010 \
  --input etc/example/dpmc/Ex0_company.csv \
  --stdout \
  --output-shares-path etc/example/dpmc/output_company \
  --no-tls

To run multiple partners (servers):

env RUST_LOG=info cargo run --release --bin dpmc-partner-server -- \
  --host 0.0.0.0:10020 \
  --company localhost:10010 \
  --input-keys etc/example/dpmc/Ex0_partner_1.csv \
  --input-features etc/example/dpmc/Ex0_partner_1_features.csv \
  --no-tls

env RUST_LOG=info cargo run --release --bin dpmc-partner-server -- \
  --host 0.0.0.0:10021 \
  --company localhost:10010 \
  --input-keys etc/example/dpmc/Ex0_partner_2.csv \
  --input-features etc/example/dpmc/Ex0_partner_2_features.csv \
  --no-tls

Start helper (client):

env RUST_LOG=info cargo run --release --bin dpmc-helper -- \
  --company localhost:10010 \
  --partners localhost:10020,localhost:10021 \
  --stdout \
  --output-shares-path etc/example/dpmc/output_partner \
  --no-tls

The above will generate one-to-one matches. To enable one-to-many matches (one record from C will match to M P records), use the flag --one-to-many M in the dpmc-helper binary, where M is the number of matches.

For example, using the same scripts as above for company and partners, to run 1-2 matching, start the helper as follows:

env RUST_LOG=info cargo run --release --bin dpmc-helper -- \
  --company localhost:10010 \
  --partners localhost:10020,localhost:10021 \
  --one-to-many 2 \
  --stdout \
  --output-shares-path etc/example/dpmc/output_partner \
  --no-tls

Delegated Private Matching for Compute with Secure Shuffling (DSPMC)

Start helper (server):

env RUST_LOG=info cargo run --release --bin dspmc-helper-server -- \
  --host 0.0.0.0:10030 \
  --stdout \
  --output-shares-path etc/example/dspmc/output_helper \
  --no-tls

Start company (server):

env RUST_LOG=info cargo run --release --bin dspmc-company-server -- \
  --host 0.0.0.0:10010 \
  --helper localhost:10030 \
  --input etc/example/dspmc/Ex0_company.csv \
  --stdout \
  --output-shares-path etc/example/dspmc/output_company \
  --no-tls

Start multiple partners (servers):

env RUST_LOG=info cargo run --release --bin dspmc-partner-server -- \
  --host 0.0.0.0:10020 \
  --company localhost:10010 \
  --input-keys etc/example/dspmc/Ex0_partner_1.csv \
  --input-features etc/example/dspmc/Ex0_partner_1_features.csv \
  --no-tls

env RUST_LOG=info cargo run --release --bin dspmc-partner-server -- \
  --host 0.0.0.0:10021 \
  --company localhost:10010 \
  --input-keys etc/example/dspmc/Ex0_partner_2.csv \
  --input-features etc/example/dspmc/Ex0_partner_2_features.csv \
  --no-tls

Start Shuffler (client):

env RUST_LOG=info cargo run --release --bin dspmc-shuffler -- \
  --company localhost:10010 \
  --helper localhost:10030 \
  --partners localhost:10020,localhost:10021 \
  --stdout \
  --no-tls

Note: Running over the network

To run over the network instead of localhost prepend the IP address with http:// or https://. For example:

To run Company (in IP 1.23.34.45):

env RUST_LOG=info cargo run --release --bin dpmc-company-server -- \
  --host 0.0.0.0:10010 \
  --input etc/example/dpmc/Ex0_company.csv \
  --stdout \
  --output-shares-path etc/example/dpmc/output_company \
  --no-tls

To run multiple partners (servers) (in IPs 76.65.54.43 and 76.65.54.44):

env RUST_LOG=info cargo run --release --bin dpmc-partner-server -- \
  --host 0.0.0.0:10020 \
  --company http://1.23.34.45:10010 \
  --input-keys etc/example/dpmc/Ex0_partner_1.csv \
  --input-features etc/example/dpmc/Ex0_partner_1_features.csv \
  --no-tls

env RUST_LOG=info cargo run --release --bin dpmc-partner-server -- \
  --host 0.0.0.0:10021 \
  --company http://1.23.34.45:10010 \
  --input-keys etc/example/dpmc/Ex0_partner_2.csv \
  --input-features etc/example/dpmc/Ex0_partner_2_features.csv \
  --no-tls

Start helper (client):

env RUST_LOG=info cargo run --release --bin dpmc-helper -- \
  --company http://1.23.34.45:10010 \
  --partners http://76.65.54.43:10020,http://76.65.54.44:10021 \
  --stdout \
  --output-shares-path etc/example/dpmc/output_partner \
  --no-tls

Citing Private-ID

To cite Private-ID in academic papers, please use the following BibTeX entries.

Delegated Private-ID

@Article{PoPETS:MMTSBC23,
  author = "Dimitris Mouris and
    Daniel Masny and
    Ni Trieu and
    Shubho Sengupta and
    Prasad Buddhavarapu and
    Benjamin M Case",
  title =   "{Delegated Private Matching for Compute}",
  volume =  2024,
  month =   Jul,
  year =    2024,
  journal = "{Proceedings on Privacy Enhancing Technologies}",
  number =  2,
  pages =   "1--24",
}

Multi-Key Private-ID

@Misc{EPRINT:BCGKMSTX21,
  author = "Prasad Buddhavarapu and
    Benjamin M Case and
    Logan Gore and
    Andrew Knox and
    Payman Mohassel and
    Shubho Sengupta and
    Erik Taubeneck and
    Min Xue",
  title = "Multi-key Private Matching for Compute",
  year = 2021,
  howpublished = "Cryptology ePrint Archive, Report 2021/770",
  note = "\url{https://eprint.iacr.org/2021/770}",
}

Private-ID

@Misc{EPRINT:BKMSTV20,
  author = "Prasad Buddhavarapu and
    Andrew Knox and
    Payman Mohassel and
    Shubho Sengupta and
    Erik Taubeneck and
    Vlad Vlaskin",
  title = "Private Matching for Compute",
  year = 2020,
  howpublished = "Cryptology ePrint Archive, Report 2020/599",
  note = "\url{https://eprint.iacr.org/2020/599}",
}

License

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

Additional Resources on Private Computation at Meta

• Delegated Multi-key Private Matching for Compute: Improving match rates and enabling adoption
• Private matching for compute
• The Value of Secure Multi-Party Computation
• Building the Next Era of Personalized Experiences
• Privacy-Enhancing Technologies and Building for the Future