개념 및 지식 허브
PDF 영구 마스킹(블랙마킹) 기밀 정보 삭제
PDF 영구 마스킹(블랙마킹) 기밀 정보 삭제
본 도구는 100% 클라이언트 환경(브라우저)에서 작동합니다. 사진, 동영상, 음성 또는 PDF 문서가 외부 서버로 절대 전송되지 않으며 로컬 메모리에서 안전하게 처리됩니다.
핵심 아키텍처 및 수학 공식
Redacted Document = Delete(String Buffer) ➔ Scrub(XREF Dictionaries) ➔ Render(Black SVG Overlay)
True redaction requires two steps: first, painting a black box over the visual coordinates, and second (the critical step), finding the actual text string in the underlying binary code and replacing it with null bytes.
모범 사례 및 필수 지침
- Never Just Use a Black Marker Tool: If you use Photoshop or Preview to draw a black box over a PDF, anyone can open the file, select the area, and copy/paste the hidden text underneath. Always use true cryptographic redaction.
- Check the Metadata: A redacted document is useless if the PDF's hidden 'Author' or 'Title' metadata still contains the sensitive names. Always scrub the document properties before release.
- Rasterize for Absolute Security: The most foolproof redaction method (used by intelligence agencies) is to print the document to a flat image (JPEG) after redacting, then convert that image back into a PDF. This mathematically guarantees no hidden text remains.
자주 묻는 질문 (FAQ)
Can true redaction be reversed?
No. If a document is properly redacted, the underlying text data is permanently deleted from the file structure. There is nothing left to recover.
Why is the redacted file size smaller?
True redaction deletes data. When you remove a massive paragraph of text and replace it with a simple black vector rectangle, the overall file size naturally decreases.
Is it safe to redact classified data here?
Yes. Because the tool operates entirely offline using local WebAssembly processing, the document data is never transmitted over a network.