Crypto-TII/claasp
Nov 2024 – Jun 2025
6 Months active
Languages Used
PythonDockerfile
Technical Skills
Code OptimizationConstraint ProgrammingCryptanalysisCryptographic AnalysisCryptographyDifferential Cryptanalysis
paulhuynh
PROFILE
Paulhuynh
Paul Huynh developed advanced cryptographic analysis tooling for the Crypto-TII/claasp repository, focusing on block cipher modeling, constraint programming, and performance optimization. Over six months, he engineered features such as hybrid differential models, flexible round key injection controls, and integrated new cipher components like ToyFeistel and ThetaGaston. His work involved Python and MiniZinc, with Dockerfile support for solver integration and deployment. Paul refactored core logic for maintainability, improved test coverage with unit and doctest enhancements, and optimized caching for matrix initialization. These contributions deepened the repository’s analytical capabilities, improved reliability, and enabled more configurable, scalable cryptographic experimentation and evaluation.
Overall Statistics
Feature vs Bugs
77%Features
Repository Contributions
28Total
Bugs
3
Commits
28
Features
10
Lines of code
4,227
Activity Months6
Your Network
34 people
Work History
June 2025
3 Commits • 1 Features
Jun 1, 2025June 2025 monthly summary focusing on key accomplishments for Crypto-TII/claasp, highlighting feature delivery, bug status, business value, and technical skills demonstrated. The work emphasizes configurable cipher behavior, maintainability, and test coverage with no reported critical bugs in scope.
3 Commits • 1 Features
Jun 1, 2025June 2025 monthly summary focusing on key accomplishments for Crypto-TII/claasp, highlighting feature delivery, bug status, business value, and technical skills demonstrated. The work emphasizes configurable cipher behavior, maintainability, and test coverage with no reported critical bugs in scope.
June 2025
May 2025
2 Commits • 2 Features
May 1, 2025May 2025 summary for Crypto-TII/claasp: Delivered two key ThetaGaston enhancements. The integration of Gaston permutation with a Theta layer into the cipher strengthens cryptographic design and resilience, complemented by a caching optimization that speeds up ThetaGaston matrix initialization. These changes include unit tests verifying correctness and performance gains, contributing to more reliable, scalable encryption workflows. No major bugs fixed this month; ongoing bug triage and maintenance continue.
May 2025
2 Commits • 2 Features
May 1, 2025May 2025 summary for Crypto-TII/claasp: Delivered two key ThetaGaston enhancements. The integration of Gaston permutation with a Theta layer into the cipher strengthens cryptographic design and resilience, complemented by a caching optimization that speeds up ThetaGaston matrix initialization. These changes include unit tests verifying correctness and performance gains, contributing to more reliable, scalable encryption workflows. No major bugs fixed this month; ongoing bug triage and maintenance continue.
April 2025
2 Commits • 1 Features
Apr 1, 2025In April 2025, Crypto-TII/claasp delivered a focused cipher component analysis refactor to improve robustness and clarity along the SKINNY/Midori path. The change refactors the inverse logic for SKINNY, enhances bit-mapping clarity, and updates tests to reflect the new analysis behavior, including switching references from Skinny to Midori and updating component IDs and constraint values. The work was complemented by test maintenance to ensure ongoing reliability, including doctest and pytest fixes. Overall, this improves the accuracy and maintainability of cipher component analysis, enabling more trustworthy security assessments and faster future enhancements.
2 Commits • 1 Features
Apr 1, 2025In April 2025, Crypto-TII/claasp delivered a focused cipher component analysis refactor to improve robustness and clarity along the SKINNY/Midori path. The change refactors the inverse logic for SKINNY, enhances bit-mapping clarity, and updates tests to reflect the new analysis behavior, including switching references from Skinny to Midori and updating component IDs and constraint values. The work was complemented by test maintenance to ensure ongoing reliability, including doctest and pytest fixes. Overall, this improves the accuracy and maintainability of cipher component analysis, enabling more trustworthy security assessments and faster future enhancements.
April 2025
March 2025
12 Commits • 3 Features
Mar 1, 2025March 2025 monthly summary for Crypto-TII/claasp. Delivered core cryptographic tooling enhancements, solver integration, and reliability improvements. Key outcomes include a configurable ToyFeistel cipher with unit tests, enhancements to Mzn Impossible XOR Differential modeling with improved search for trails and clusters, and the integration of the HiGHS MILP solver with CLI support and Dockerfile steps. Also stabilized test and documentation reliability (doctests and PyTest expectations), and improved QARMAv2 block cipher initialization/assignment reliability. These updates increase modeling accuracy, enable scalable optimization workflows, and elevate overall code quality and maintainability.
March 2025
12 Commits • 3 Features
Mar 1, 2025March 2025 monthly summary for Crypto-TII/claasp. Delivered core cryptographic tooling enhancements, solver integration, and reliability improvements. Key outcomes include a configurable ToyFeistel cipher with unit tests, enhancements to Mzn Impossible XOR Differential modeling with improved search for trails and clusters, and the integration of the HiGHS MILP solver with CLI support and Dockerfile steps. Also stabilized test and documentation reliability (doctests and PyTest expectations), and improved QARMAv2 block cipher initialization/assignment reliability. These updates increase modeling accuracy, enable scalable optimization workflows, and elevate overall code quality and maintainability.
February 2025
2 Commits • 1 Features
Feb 1, 2025February 2025 monthly summary for Crypto-TII/claasp focusing on delivering robust cryptanalysis tooling and performance optimization. Key work included fixing inverse permutation handling and conditional inverse-key constraint application in the MZN differential cryptanalysis model, significantly improving robustness when no input key is present, and refactoring LowMC to a more compact S-box and linear layer representation, removing the sbox_layer_picnic dependency and updating the S-box lookup table to boost efficiency and maintainability.
2 Commits • 1 Features
Feb 1, 2025February 2025 monthly summary for Crypto-TII/claasp focusing on delivering robust cryptanalysis tooling and performance optimization. Key work included fixing inverse permutation handling and conditional inverse-key constraint application in the MZN differential cryptanalysis model, significantly improving robustness when no input key is present, and refactoring LowMC to a more compact S-box and linear layer representation, removing the sbox_layer_picnic dependency and updating the S-box lookup table to boost efficiency and maintainability.
February 2025
November 2024
7 Commits • 2 Features
Nov 1, 2024November 2024 (Crypto-TII/claasp): Delivered substantive modeling and constraint improvements to advance cipher analysis capabilities, with a focus on differential trail analysis and maintainability. Key enhancements include probabilistic extensions to the Hybrid Impossible XOR Differential Model, enabling probabilistic key propagation and optional probabilistic handling of the key schedule, along with extended DDT calculations for S-boxes and AND/OR operations and enlarged variable domains for identifying unique active nonlinear components. In parallel, SBOX constraint tooling was refactored to reduce code duplication, introduced a generic cp_xor_differential_propagation_constraints path, and updated doctests to reflect revised constraint definitions and outputs. These efforts were complemented by targeted doctest improvements and whitespace corrections to improve reliability. The combined work improves analysis accuracy, shortens iteration cycles for cipher evaluation, and strengthens code quality for future features.
November 2024
7 Commits • 2 Features
Nov 1, 2024November 2024 (Crypto-TII/claasp): Delivered substantive modeling and constraint improvements to advance cipher analysis capabilities, with a focus on differential trail analysis and maintainability. Key enhancements include probabilistic extensions to the Hybrid Impossible XOR Differential Model, enabling probabilistic key propagation and optional probabilistic handling of the key schedule, along with extended DDT calculations for S-boxes and AND/OR operations and enlarged variable domains for identifying unique active nonlinear components. In parallel, SBOX constraint tooling was refactored to reduce code duplication, introduced a generic cp_xor_differential_propagation_constraints path, and updated doctests to reflect revised constraint definitions and outputs. These efforts were complemented by targeted doctest improvements and whitespace corrections to improve reliability. The combined work improves analysis accuracy, shortens iteration cycles for cipher evaluation, and strengthens code quality for future features.
Activity
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Quality Metrics
Correctness90.4%
Maintainability89.6%
Architecture88.2%
Performance80.8%
AI Usage22.2%
Skills & Technologies
Programming Languages
DockerfilePython
Technical Skills
Backend DevelopmentBlock CiphersCachingCipher DesignCipher ImplementationCode DocumentationCode OptimizationCode RefactoringComponent DesignConstraint ProgrammingCryptanalysisCryptographic AnalysisCryptographyDebuggingDevOps
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