PdfProcessing: CryptographicException is thrown when importing AES encrypted document with DocumentInfo

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Last Updated: 28 Jan 2026 14:54 by ADMIN

Jeff

Created on: 27 Jan 2026 14:05

Category: PdfProcessing

Type: Bug Report

PdfProcessing: CryptographicException is thrown when importing AES encrypted document with DocumentInfo

CryptographicException is thrown when importing AES encrypted document with DocumentInfo.

2 comments

ADMIN

Martin

Posted on: 28 Jan 2026 08:20

Hi Jeff,

Thank you for the additional feedback. We already investigated the issue and it seems the real problem is that when creating an encrypted document using AES encryption the encrypted data randomly contains special characters that are not correctly handled during the import process and this is breaking the encrypted data because of escaping this characters (e.g. in "/Title (§ÙQÕY\(}¿X4Zµ\(ç ÷È>G¼t5–Ï0)" the characters are "\(").

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Regards,
Martin
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Jeff

Posted on: 27 Jan 2026 18:04

The exact error is as follows: System.Security.Cryptography.CryptographicException: 'Padding is invalid and cannot be removed.' This issues happens randomly when calling PdfFormatProvider's import method on a PDF encrypted with AES256.