PDF Signature
Digital PDF Signature
A cryptographic signature embedded in a PDF that verifies the signer's identity and ensures the document hasn't been altered.
Technical Detail
In the PDF specification (ISO 32000-2:2020), pdf signature is implemented as a specialized object within the document's object graph. PDF files use a cross-reference table to index every object by byte offset, enabling random access without sequential parsing. This architecture allows pdf signature to be read, modified, or extracted independently of other document elements. The binary structure supports incremental saves, where changes append to the file without rewriting existing content.
Example
```javascript
// PDF Signature: PDF manipulation example
import { PDFDocument } from 'pdf-lib';
const pdfDoc = await PDFDocument.load(fileBytes);
const pages = pdfDoc.getPages();
console.log(`Pages: ${pages.length}`);
```
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