docs(10_Wiki): 위키 전체 재구성 — Topic_* 폴더를 4개 카테고리로 통합 + 대규모 중복 제거

Topic_Agent/Topic_Blog/Topics/Topics_Biz/Topics_Meeting/Topics_Rag의 마크다운 지식 문서를
Topic_General/Topic_Programming/Topic_Graphic/Topic_Business 4개 카테고리로 재분류.

- 중복 제거: frontmatter의 status:duplicate/merged + duplicate_of/redirect_to 필드로
  자기 자신을 중복으로 선언한 리다이렉트 stub 1032개 제거, 완전 동일 내용 파일 472개 제거,
  동일 파일명·다른 내용 충돌 시 더 큰(완전한) 버전만 유지(162개 제거) — 총 1639개 중복 제거.
- 분류: 폴더 단위로 명확한 항목(AI_and_ML/Coding/Architecture 등 → Programming,
  Comfyui/Visual_Effects → Graphic, Topics_Biz/Topics_Meeting/사업 등 → Business,
  Poetic_Blog_Writing/창의성/Game_Design 등 → General)은 폴더 우선순위로,
  나머지 혼재 폴더(Topic_Agent/Topic_Blog/Topics 루트/Thinking & Reasoning/Other/UI_UX_Assets)는
  title/tags 키워드 스코어링으로 파일 단위 분류(불명확한 경우 General로 폴백).
  원본 폴더명은 "From_*" 서브폴더로 보존해 추적 가능성 유지.
- 최종 배치: Programming 2784 / General 1608 / Graphic 285 / Business 249 = 4926개 문서.
- 에이전트 운영 상태(.astra/.agent/.obsidian/sessions/memory/_company/docs/lessons/_shared/src)는
  지식 콘텐츠가 아니므로 재분류 대상에서 제외하고 원위치 유지.
- Topics/Topic_email(상위 보호 폴더 Topic_email과 파일명 100% 중복) 삭제 — 보호 폴더 자체는 미변경.
- 완전히 비게 된 Topic_Agent/Topic_Blog/Topics_Biz/Topics_Rag 폴더 제거.
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---
id: wiki-2026-0508-code-stylometry-코드-문체론
title: Code Stylometry (코드 문체론)
category: 10_Wiki/Topics
status: verified
canonical_id: self
aliases: [Authorship Attribution, Code Fingerprinting, Programmer Identification]
duplicate_of: none
source_trust_level: A
confidence_score: 0.9
verification_status: applied
tags: [security, ml, forensics, privacy]
raw_sources: []
last_reinforced: 2026-05-10
github_commit: pending
tech_stack:
language: Python
framework: scikit-learn/transformers
---
# Code Stylometry (코드 문체론)
## 매 한 줄
> **"매 코드 작성자를 매 stylistic feature 로 식별하는 ML 기법"**. Caliskan et al. 2015 (USENIX) 가 random forest 로 250 명 중 94% 식별. 매 modern era — CodeBERT/StarCoder embedding 기반 분류기로 매 더 강력해짐. Privacy 위협 (anonymous contributor de-anon) ↔ defensive utility (malware attribution, plagiarism detection) 의 양날.
## 매 핵심
### 매 feature class
- **Lexical**: identifier naming (camelCase vs snake_case), keyword frequency.
- **Layout**: indentation, brace style, line length.
- **Syntactic**: AST node distribution, depth, n-gram of node types.
- **Idiomatic**: preferred construct (`for` vs `map`, ternary vs if).
- **Embedding-based**: CodeBERT/StarCoder hidden states (2024+).
### 매 attack scenario
- De-anonymizing GitHub anonymous account.
- Linking malware author across samples.
- Plagiarism detection in coursework.
- Insider threat attribution.
### 매 응용
1. Forensic attribution (FBI/Interpol cases).
2. Academic integrity (MOSS, JPlag).
3. Bug-injection-source detection (xz-style supply chain).
## 💻 패턴
### Layout features
```python
import re
def layout_features(src: str) -> dict:
lines = src.split('\n')
return {
'avg_line_len': sum(len(l) for l in lines) / max(len(lines), 1),
'tab_ratio': sum(l.startswith('\t') for l in lines) / max(len(lines), 1),
'blank_ratio': sum(not l.strip() for l in lines) / max(len(lines), 1),
'snake_ratio': len(re.findall(r'\b[a-z]+_[a-z]+\b', src)),
'camel_ratio': len(re.findall(r'\b[a-z]+[A-Z][a-z]+\b', src)),
}
```
### AST n-gram (Python)
```python
import ast
from collections import Counter
def ast_ngrams(src: str, n=3):
tree = ast.parse(src)
seq = [type(node).__name__ for node in ast.walk(tree)]
return Counter(tuple(seq[i:i+n]) for i in range(len(seq)-n+1))
```
### Random forest classifier (Caliskan-style)
```python
from sklearn.ensemble import RandomForestClassifier
from sklearn.feature_extraction import DictVectorizer
vec = DictVectorizer(sparse=False)
X = vec.fit_transform([extract_all_features(s) for s in samples])
clf = RandomForestClassifier(n_estimators=300, max_depth=20)
clf.fit(X, authors)
print(clf.score(X_test, y_test)) # ~90%+ on 100-author corpus
```
### CodeBERT embedding classifier (2024+)
```python
from transformers import AutoTokenizer, AutoModel
import torch
tok = AutoTokenizer.from_pretrained('microsoft/codebert-base')
model = AutoModel.from_pretrained('microsoft/codebert-base').eval()
def embed(src: str) -> torch.Tensor:
inp = tok(src, truncation=True, max_length=512, return_tensors='pt')
with torch.no_grad():
out = model(**inp).last_hidden_state[:, 0] # CLS
return out.squeeze()
# Then train linear classifier on embeddings
```
### Defensive: code anonymizer
```python
# Normalize to defeat stylometry
import black, autopep8
def anonymize(src: str) -> str:
src = black.format_str(src, mode=black.Mode()) # uniform layout
# rename identifiers via AST transform
# replace idiosyncratic constructs with canonical form
return src
```
## 매 결정 기준
| 상황 | Approach |
|---|---|
| Small corpus (<50 authors) | RF on hand-crafted features |
| Large corpus, deep features | CodeBERT/StarCoder embedding + classifier |
| Defending privacy | Black/Prettier + identifier normalization |
| Adversarial robust attack | Limited — formatting tools 매 defeat 대부분 |
| Cross-language | Embedding-based 만 가능 |
**기본값**: 매 RF + AST n-gram 으로 baseline. Embedding 으로 boost.
## 🔗 Graph
- 부모: [[Authorship Attribution]]
- 응용: [[Supply Chain Security]]
- Adjacent: [[Code Obfuscation]] · [[AST]]
## 🤖 LLM 활용
**언제**: Forensic context, plagiarism check, OSS contributor analysis.
**언제 X**: Identifying anonymous whistleblower — ethical 매 거부.
## ❌ 안티패턴
- **Single-feature reliance**: layout 만 → autoformatter 로 매 trivial defeat.
- **Ignoring base rate**: low base rate = high false positive rate (Bonferroni).
- **Author-set assumption**: open-world (unknown author) ≠ closed-world.
- **Privacy ignored**: deploying on anonymous code 매 ethical review 없이.
## 🧪 검증 / 중복
- Verified (Caliskan USENIX 2015, Abuhamad 2018, CodeBERT papers).
- 신뢰도 A.
## 🕓 Changelog
| 날짜 | 변경 |
|---|---|
| 2026-05-08 | Phase 1 |
| 2026-05-10 | Manual cleanup — stylometry features + RF/CodeBERT pipelines |