David works on the scanning pipeline and API that power Codequiry checks at scale, from ingestion to results delivery.
General
12 min
David Kim
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1 week ago
An AI detection score is a signal, not a verdict. This is the four-stage triage I borrowed from a fintech incident pipeline to decide which alerts deserve a conversation, which deserve a case file, and which deserve to be closed.
General
10 min
David Kim
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1 week ago
Line diffing under-reports copied code and over-reports similar-looking code. Here's what token normalization and AST fingerprinting actually compare, where each one breaks, and how to wire both into a CI pipeline or an academic submission workflow.
General
7 min
David Kim
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3 weeks ago
License scanning went from hand-checking COPYING files to SPDX metadata and policy-as-code gates. This piece traces that arc, shows which gaps still let copied code slip through, and explains how to pair license scans with source matching for audit-grade evidence.
General
11 min
David Kim
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3 weeks ago
A DevSecOps lead's field notes on running AI-generated code detection as a merge request gate in GitLab CI, with the exact YAML, thresholds, and audit trail decisions that survived a fintech rollout.
General
8 min
David Kim
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1 month ago
Most vendor code passes unit tests and static analysis. It fails provenance checks. This is the exact merge gate I run in a fintech CI pipeline: Codequiry's plagiarism and AI scans wired into GitHub Actions, with thresholds, evidence review, and a failure policy.
General
4 min
David Kim
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2 months ago
A technical deep-dive into how modern plagiarism checkers spot code lifted from the open web. We walk through crawling, token-based fingerprinting, and matching algorithms that survive renaming and refactoring, with real examples and a look at where tools like MOSS fall short.
General
12 min
David Kim
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2 months ago
A deep-dive comparison of MOSS, JPlag, Dolos, and hybrid detectors on deliberately obfuscated student Java code. Token-based algorithms catch most refactoring, but AI-generated obfuscation is changing the game — and combining similarity checks with AI detection is the only reliable way to stay ahead.
General
11 min
David Kim
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2 months ago
When you teach 400 students each semester, “check the MOSS output” stops being a casual Friday task and becomes a logistical nightmare. After three iterations of the same introductory Java course, I’ve settled on a repeatable workflow that catches collusion without sacrificing evenings, weekends, or relationships with honest students. Here’s exactly how the pipeline works, what tools sit where, and where Codequiry finally closed the gap I was losing sleep over.
General
10 min
David Kim
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2 months ago
Most CS instructors trust MOSS to catch code copying — but how much renaming actually breaks it? This step-by-step guide shows you how to run a controlled experiment, measure the exact threshold where token-based similarity collapses, and see why a multi-stage engine that combines tokens with AST fingerprinting catches what MOSS misses.
Case Studies
2 min
David Kim
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3 months ago
When intro programming students at a mid-sized community college were copying entire code snippets from Stack Overflow and GitHub, the department needed a scalable detection solution. By integrating Codequiry’s web-source matching into their grading pipeline, they reduced surface-level copy-paste incidents by 40% in a single semester while cutting manual review time by 60%.
General
8 min
David Kim
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4 months ago
Winnowing fingerprinting is a powerful technique for detecting code plagiarism that survives variable renaming, refactoring, and cosmetic changes. This case study examines how the algorithm works, where it succeeds, and where it falls short compared to AST-based approaches.
General
9 min
David Kim
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4 months ago
Not all code similarity is plagiarism, and not all plagiarism is caught by string matching. This article breaks down the three major detection techniques—AST comparison, token-based analysis, and algorithmic fingerprinting—and explains what each one actually reveals about student submissions.