HElib 2.3.0, July 2023

(tagged as v2.3.0)

• Added support for processing queries with the NOT operator homomorphically.

• Introduced the NOT Expr, and a corresponding inline NOT QueryExpr Within the weights, or CNF, framework:

  • Extensions to the ExpandOr() function to queries with NOT operators, via a new function negate()
  • New function Tidy() which eliminates duplicate columns in inner clauses, or columns and their negation in inner clauses that can be created by squashing ORs. It also eliminates empty clauses,
  • Put the code from build() which constructed the corresponding weights into a new function buildWeights(), and extended this to the case there are negations of columns
  • New framework which evaluates queries homomorphically directly from the string:
  • New function removeOr() within the QueryBuilder class which generates a new query string which is logically equivalent, but only has Ands and Nots
  • Overloaded contains() function that takes a string instead of a QueryType, and evaluates the RPN directly using a stack of ciphertexts

• Updated CI

  • Deprecated build&test on Ubuntu 20.04
  • Updated build&test on Ubuntu 22.04
  • Added build&test on macOS 12 and MacOS13

• Bug Fixes

Co-authored-by: @TabOg Co-authored-by: @faberga Co-authored-by: @jlhcrawford Co-authored-by: @hamishun

(tagged as v2.2.2)

Bug Fixes

• Fix for clang 14 error
• Minor fix in multiplyPtxt
• Fix Queryambigous OR
• Fix in partialMatch

Updates

• Optimizations of Frobenius automorphisms
• Multi-threaded reader for PSI iO
• Update HEXL version
• Update CI to latest gcc + clang compilers
• Update CI to test on Ubuntu 22.04
• Make assignment of contains Or stick in query builder
• Extension of HElib's PSI/partial match engine to add functionality that allows HEQL queries to be passed in at runtime via strings.
• IO utility for databases and queries
• Documentation updates

Co-authored-by: @jlhcrawford Co-authored-by: @TabOg Co-authored-by: @hamishun Co-authored-by: @faberga Co-Authored-by: @sajetan

Full Changelog: https://github.com/homenc/HElib/compare/v2.2.1...v2.2.2

(tagged as v2.2.1)

• Improved NTT benchmark code
• CI update
• Improvements to partial match logic
• Bug fixes

Co-authored-by: @fboemer Co-authored-by: @jlhcrawford Co-authored-by: @hamishun

HElib 2.2.0, September 2021

(tagged as v2.2.0)

• Intel HEXL integration (experimental)
  • HEXL NTT acceleration for m as a power of 2
  • HEXL acceleration to fundamental ciphertext operations
  • Documentation update
• Update NTL dependency to version 11.5.1
• Update GMP dependency to version 6.2.1
• Updates to benchmarks
• Bug fixes

Co-authored-by: @hamishun Co-authored-by: @jlhcrawford Co-authored-by: @faberga Co-authored-by: @fboemer

HElib 2.1.0, March 2021

(tagged as v2.1.0)

• Deprecated APIs
  • Documentation update: deprecated list
  • Marked functions as deprecated
  • Updated examples
• Documentation update: PtxtArray JSON IO
• Bug fixes

Co-Authored-by: @jlhcrawford Co-Authored-by: @dubek Co-Authored-by: @mhillenbrand

HElib 2.0.0, January 2021

(tagged as v2.0.0)

• Contains API changes that are not backwards compatible with v1.x.x
  • Changes to Context API
  • Must use ContextBuilder to build context
  • New serialization APIs: binary and JSON
• CKKS coding tutorials
• Bug fixes

Co-Authored-by: @faberga Co-Authored-by: @jlhcrawford Co-Authored-by: @shaih Co-Authored-by: @hamishun Co-Authored-by: @victorshoup Co-Authored-by: @esteffin

HElib 1.3.1, December 2020

(tagged as v1.3.1)

December 2020

• Refactoring of CKKS Mitigation
• Re-instated Ctxt isCorrect
• Ctxt Conjugation fix
• Added GMP and NTL alternative download locations

Co-Authored-by: Flavio Bergamaschi [email protected] Co-authored-by: Jack Crawford [email protected] Co-Authored-by: Shai Halevi [email protected] Co-authored-by: Hamish Hunt [email protected] Co-authored-by: Victor Shoup [email protected] Co-authored-by: Enrico Steffinlongo [email protected]

HElib 1.3.0, December 2020

(tagged as v1.3.0)

November-December 2020

• Mitigation for the CKKS vulnerability recently observed by Li and Micciancio
• Context Builder using builder pattern
• HElib now requires C++17

Co-Authored-by: Flavio Bergamaschi [email protected] Co-authored-by: Jack Crawford [email protected] Co-Authored-by: Shai Halevi [email protected] Co-authored-by: Hamish Hunt [email protected] Co-authored-by: Victor Shoup [email protected] Co-authored-by: Enrico Steffinlongo [email protected]

HElib 1.2.0, November 2020

(tagged as v1.2.0)

October-November 2020

• Mitigation for potential CKKS vulnerability.
• Additional API changes for parameters to the CKKS encoding functions.
• New infrastructure for benchmarks
• Updated ClonedPtr
• Additional Ctxt tests
• Bug Fixes:

Co-Authored-by: Flavio Bergamaschi [email protected] Co-authored-by: Jack Crawford [email protected] Co-Authored-by: Shai Halevi [email protected] Co-authored-by: Hamish Hunt [email protected] Co-authored-by: Victor Shoup [email protected] Co-authored-by: Enrico Steffinlongo [email protected]

HElib 1.1.0, October 2020

(tagged as v1.1.0)

June-October 2020

• Updated & enhanced security level estimation
• Experimental Tool for computing sample parameters for CKKS
• Utils
  • create-context
  • encrypt/decrypt
  • encode/decode examples
• Improvements to noise management
• New examples and mini-tutorial on private preserving db query
• Configurable PSI/PIR beta
• Some tools in misc/ for code formatting and algebra generation
• Improved testing procedures
• Move to CMake >= 3.10.2
• Improved documentation
• Doxygen improved look and feel
• Multi platform and multi configuration Travis-CI pipeline
• Warning messages are now logged (default helib.log)
• Bug Fixes:
  • CKKS divide by zero
  • version.h
  • compatibility with cmake 3.10.x

Co-authored-by: @faberga Co-authored-by: @hamishun Co-authored-by: @esteffin Co-authored-by: @jlhcrawford Co-authored-by: @shaih Co-authored-by: @victorshoup