Alex focuses on refactoring-resistant similarity detection and benchmarking Codequiry against tools like MOSS, JPlag and Dolos.
General
9 min
Alex Petrov
•
2 days ago
A bootcamp instructor explains how token-level perplexity works as an AI code signal, what thresholds we actually use in Java review, and why a single statistical score is never enough on its own.
General
11 min
Alex Petrov
•
2 weeks ago
A 400-student Python course adopted Codequiry to check submissions for plagiarism and AI generation. The instructor found that 18% of assignments contained copy-pasted code from Chegg, and 12% showed strong signs of LLM authorship — a pattern that peer-only checks had missed entirely.
General
11 min
Alex Petrov
•
2 weeks ago
When Riverside University’s CS department ran an AI detector across 300 CS2 assignments alongside MOSS, they discovered a new layer of academic integrity challenges. The case study reveals what they found, how they calibrated thresholds, and why combining AI detection with source-code fingerprinting changed their grading workflow.
General
11 min
Alex Petrov
•
3 weeks ago
A copied snippet might survive a human code review after a quick variable rename and loop inversion. A similarity checker that understands ASTs won’t be fooled. This guide walks through wiring Codequiry’s API into your Git pre‑commit workflow, step by step, so every commit is scanned for non‑original code before it hits the branch.
General
12 min
Alex Petrov
•
1 month ago
Winnowing fingerprinting is the back‑bone of tools like MOSS that spot copied code even after students rename every variable and shuffle blocks. This deep‑dive unpacks the algorithm, its thresholds, and why a multimodal approach—token, AST, and web‑source checking—covers the gaps that fingerprinting alone leaves open.
General
10 min
Alex Petrov
•
1 month ago
Traditional similarity tools like MOSS and JPlag compare student submissions against each other but leave a massive blind spot: code copied directly from Stack Overflow, GitHub repositories, and online tutorials. This article examines how web source detection works, what it catches that peer comparison misses, and why both approaches together give you the real picture of code originality.
General
9 min
Alex Petrov
•
2 months ago
Code similarity analysis isn't just for catching student plagiarism. Organizations use the same techniques to identify GPL and other open source license violations in their proprietary codebases. This article walks through the algorithms, real-world cases, and practical workflows for automated license compliance auditing.
General
3 min
Alex Petrov
•
2 months ago
Students often try to hide copied code by renaming variables, restructuring loops, or inserting dead code. AST-based comparison resists many of these tricks, but some deliberate obfuscation—like flattening control flow or converting recursion to iteration—can still produce a false negative. This article examines where AST engines excel, where they fall short, and how combining structural matching with token signatures catches the most clever attempts.
Academic Integrity
9 min
Alex Petrov
•
2 months ago
Simple changes to assignment design—unique interfaces, randomized test harnesses, and automated similarity checks—drastically reduce code plagiarism. This guide walks through six concrete tactics with real code examples and grading workflows.
Case Studies
7 min
Alex Petrov
•
2 months ago
By aggregating similarity scores across 4,200 student Python submissions over three semesters, we uncovered distinct copy-paste behaviors tied to assignment type, submission deadline, and language features. This practical guide walks through the exact process of running a large-scale code reuse audit using Codequiry’s output and Python data analysis, then shows how to turn those numbers into actionable course design decisions.
Tutorials
7 min
Alex Petrov
•
2 months ago
Setting up automated code plagiarism and similarity checks inside a CI pipeline cuts manual grading time and catches copying that individual reviewers miss. This practical guide walks through the architecture, tooling choices, and honest tradeoffs of running MOSS, JPlag, or Codequiry’s API on every lab push.
Academic Integrity
9 min
Alex Petrov
•
3 months ago
A retrospective on automatic grading in computer science education—from shell scripts comparing output strings to modern platforms combining unit tests, static analysis, and code similarity detection. What we gained, what we lost, and why integrity pipelines matter more than ever.