EasyCrypt/easycrypt
Nov 2024 – Sep 2025
5 Months active
Languages Used
DockerfileShellCoqEasyCrypt
Technical Skills
Build AutomationDockerOCamlCI/CDFormal VerificationFunctional Programming
François Dupressoir
PROFILE
François Dupressoir
François Duprat contributed to the EasyCrypt/easycrypt repository by engineering features and fixes that advanced formal verification workflows and improved maintainability. He upgraded Docker-based build automation to streamline environment provisioning with OCaml and Dockerfile, enhancing reproducibility for CI and local development. François removed the Alt-Ergo prover dependency, simplifying deployment in commercial contexts and updating proof configurations for standalone operation. He refactored mathematical functions, deriving ceil from floor to reduce duplication and align algebraic reasoning. His work included formalizing map range lemmas and replacing axioms with proven theorems in distribution measures, demonstrating depth in theorem proving, functional programming, and mathematical proof.
Overall Statistics
Feature vs Bugs
83%Features
Repository Contributions
6Total
Bugs
1
Commits
6
Features
5
Lines of code
573
Activity Months5
Work History
September 2025
1 Commits
Sep 1, 2025Month 2025-09, EasyCrypt/easycrypt: Implemented formal correctness improvement in distribution measures by replacing an axiom with a proven lemma for witness_support, ensuring non-zero measure implies existence of an element satisfying the predicate. This strengthens reliability of formal proofs and reduces axiom-based uncertainty.
1 Commits
Sep 1, 2025Month 2025-09, EasyCrypt/easycrypt: Implemented formal correctness improvement in distribution measures by replacing an axiom with a proven lemma for witness_support, ensuring non-zero measure implies existence of an element satisfying the predicate. This strengthens reliability of formal proofs and reduces axiom-based uncertainty.
September 2025
May 2025
1 Commits • 1 Features
May 1, 2025May 2025 (EasyCrypt/easycrypt) delivered a key feature to derive ceil from floor, improving consistency and maintainability of math functions. The refactor eliminates duplication of results and lemmas between ceil and floor, ensuring aligned behavior and simplifying future changes. Commit 6ead268653bd7d20ff285b16dbae2d7051b2eafe ('extend results on ceil 'for free'') captures this work. No major bugs fixed are recorded for this period in the provided data. Overall, the work reduces risk in mathematical proofs and cryptographic verification by tightening function semantics, while improving maintainability and future-proofing the math library. Technologies/skills demonstrated include refactoring for maintainability, algebraic reasoning alignment between related functions, and evidence-based improvement of code quality.
May 2025
1 Commits • 1 Features
May 1, 2025May 2025 (EasyCrypt/easycrypt) delivered a key feature to derive ceil from floor, improving consistency and maintainability of math functions. The refactor eliminates duplication of results and lemmas between ceil and floor, ensuring aligned behavior and simplifying future changes. Commit 6ead268653bd7d20ff285b16dbae2d7051b2eafe ('extend results on ceil 'for free'') captures this work. No major bugs fixed are recorded for this period in the provided data. Overall, the work reduces risk in mathematical proofs and cryptographic verification by tightening function semantics, while improving maintainability and future-proofing the math library. Technologies/skills demonstrated include refactoring for maintainability, algebraic reasoning alignment between related functions, and evidence-based improvement of code quality.
February 2025
1 Commits • 1 Features
Feb 1, 2025February 2025 — Delivered a pivotal feature in EasyCrypt/easycrypt by removing the Alt-Ergo prover dependency, enabling standalone operation without external provers. This change simplifies deployment for customers using commercial licenses or non-free contexts, reduces external tooling fragility, and lowers total cost of ownership. Configurations and example proofs were updated to reflect the new standalone flow, ensuring a smooth transition for users. The work strengthens marketability by improving usability and flexibility, while preserving core proof capabilities.
1 Commits • 1 Features
Feb 1, 2025February 2025 — Delivered a pivotal feature in EasyCrypt/easycrypt by removing the Alt-Ergo prover dependency, enabling standalone operation without external provers. This change simplifies deployment for customers using commercial licenses or non-free contexts, reduces external tooling fragility, and lowers total cost of ownership. Configurations and example proofs were updated to reflect the new standalone flow, ensuring a smooth transition for users. The work strengthens marketability by improving usability and flexibility, while preserving core proof capabilities.
February 2025
January 2025
2 Commits • 2 Features
Jan 1, 2025January 2025: Key feature deliveries focused on correctness of map data structures and CI reliability. Highlights include formal range lemmas for FMap (rng_set and rng_set_notin) and a CI workflow enhancement directing XSalsa CI to a development branch for faster, safer testing. No major bug fixes were recorded this month; efforts concentrated on strengthening correctness guarantees, improving integration risk, and enabling faster feedback to stakeholders. Business value: improved correctness of map operations, reduced regression risk, and more predictable CI validation for cryptography-related components.
January 2025
2 Commits • 2 Features
Jan 1, 2025January 2025: Key feature deliveries focused on correctness of map data structures and CI reliability. Highlights include formal range lemmas for FMap (rng_set and rng_set_notin) and a CI workflow enhancement directing XSalsa CI to a development branch for faster, safer testing. No major bug fixes were recorded this month; efforts concentrated on strengthening correctness guarantees, improving integration risk, and enabling faster feedback to stakeholders. Business value: improved correctness of map operations, reduced regression risk, and more predictable CI validation for cryptography-related components.
November 2024
1 Commits • 1 Features
Nov 1, 20242024-11 Monthly Summary for EasyCrypt/easycrypt: Delivered an upgrade of the Docker image to Alt-Ergo 2.6.0 and added comprehensive setup tooling to automate environment provisioning. The tooling creates an OCaml switch, pins Alt-Ergo, installs dependencies and the package, cleans up the switch, and exposes a symlink for fast access to the new version. This work enhances reproducibility, reduces setup time for local development and CI, and ensures compatibility with Alt-Ergo 2.6 features in the verification workflow.
1 Commits • 1 Features
Nov 1, 20242024-11 Monthly Summary for EasyCrypt/easycrypt: Delivered an upgrade of the Docker image to Alt-Ergo 2.6.0 and added comprehensive setup tooling to automate environment provisioning. The tooling creates an OCaml switch, pins Alt-Ergo, installs dependencies and the package, cleans up the switch, and exposes a symlink for fast access to the new version. This work enhances reproducibility, reduces setup time for local development and CI, and ensures compatibility with Alt-Ergo 2.6 features in the verification workflow.
November 2024
Activity
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Quality Metrics
Correctness91.6%
Maintainability90.0%
Architecture88.4%
Performance86.6%
AI Usage20.0%
Skills & Technologies
Programming Languages
CoqDockerfileEasyCryptShell
Technical Skills
Build AutomationCI/CDDockerFormal MethodsFormal VerificationFunctional ProgrammingMathematical ProofOCamlSoftware EngineeringTheorem Proving
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