Overview

PETAce

Privacy-Enhancing Technologies via Applied Cryptography Engineering (PETAce) is a framework for privacy-preserving computing. It provides strong privacy guarantee by analytzing and computing cryptographically pseudonymized data without revealing hidden sensitive information. It consists of the following parts:

• The “user interface” layer provides users with high-level programming interfaces for collaborative data analysis (SecureNumpy), joint SQL query (SecureSQL), and privacy-preserving machine learning (SecureML). It also supports large-scale data computing by combining Secure Multi-party Computation and parallel processing systems (such as Spark).

• The “virtual machine” layer is responsible for parsing high-level language into secure multi-party computation (MPC) operators, and performing automatic optimization and scheduling.

• The “protocol” layer includes secure multi-party computation protocols, such as general-purpose two-party secure computation protocols, privacy set intersection, and privacy information retrieval, etc.

• The “primitive” layer consists of standard cryptographic algorithms and protocols, differential privacy mechanisms, and abstract network interfaces, etc.

PETAce enables fast prototyping of ideas based on privacy-enhancing technologies, and we plan to integrate state-of-the-art research results into the PETAce in future releases. Its core modules are implemented in C++ and are modularized into the following repositories.

• PETAce-Solo implements primitive hashing, encryption, and randomness generation algorithms performed by one party.
  • Hash functions: SHA-256, SHA3-256, and BLAKE2b
  • Psuedo-random number generators based on: SHAKE_128, BLAKE2Xb, and AES_ECB_CTR.
  • Sampling of bytes, 32-bit unsigned integers, and 64-bit unsigned integers from the uniform distribution
  • Prime field elliptic curve group arithmetics including hash-to-curve
  • Hashing tables: Cuckoo hashing and simple hashing
  • Partially homomorphic encryption: the Paillier cryptosystem
• PETAce-Verse includes frequently used cryptographic subprotocols such as oblivious transfer and oblivious shuffling.
  • Naor-Pinkas OT
  • IKNP OT with optimization
  • KKRT OT
• PETAce-Duet abstracts general-purpose two-party secure computing operator protocols.
  • Protocols from ABY
  • Secure comparison protocols from Cheetah
  • The secure random shuffling protocol from Secret-Shared Shuffle
  • Protocols that convert arithmetic shares to and from ciphertexts of the Paillier cryptosystem
• PETAce-SetOps archives several protocols that perform private set operations.
  • An ECDH-PSI protocol based on Elliptic-Curve Diffie-Hellman
  • The KKRT-PSI protocol based on Oblivious Pseudorandom Functions (OPRF)
  • A private join and compute protocol based on Circuit-PSI
• PETAce-Network provides a preliminary interface of network communication.
  • Network abstract interface
  • Socket network implementation