Encryption and Decryption of Image file using AES and RSA

You can try using the LEADDocument class from the LEADTOOLS SDK as it supports both the loading of encrypted files and decryption. The PDFSecurityOptions class will let you apply encryption to your PDF documents. When loading in the document that is encrypted, you can add a check in your application to handle the loading and decrypting of your files:

using (var document = DocumentFactory.LoadFromFile(Path.Combine(ImagesPath.Path, "Protected.pdf"), options))

{

if (document.IsEncrypted && !document.IsDecrypted)

{

Console.WriteLine("Encrypted Document, decrypting it...");

// Decrypt it now

document.Decrypt("password");

}

}

https://www.leadtools.com/help/sdk/v21/dh/dox/leaddocument-isencrypted.html

https://www.leadtools.com/help/sdk/v21/dh/to/loading-encrypted-files-using-the-document-library.html

https://www.leadtools.com/help/sdk/v21/dh/dox/loaddocumentoptions-password.html

https://www.leadtools.com/help/sdk/v21/dh/pdf/pdfsecurityoptions.html