SecureBlackbox Knowledge Base

Recent PDF Articles


Troubleshooting: printing the signature background image

Follow this KB when the signature background image does not print or is corrupted.

When I try to sign the data using the certificate contained in Windows (with a non-exportable private key), only the MD5 hash algorithm works, even if I manually specify the SHA* algorithm.

The Windows CryptoAPI doesn't support SHA algorithms for signing by default, so SecureBlackbox reverts to MD5 if the CryptoAPI must be used for signing (this is …

When I use Acrobat 6.0, click the signature, and click Signature Properties, why do I get a bad parameter error in Acrobat?

When I use Acrobat 6.0, click the signature and click Signature Properties, why do I get a bad parameter error in Acrobat?

When I specify a Windows (or PKCS#11) certificate storage for signing, why do I get the following error: No signing certificate found?

Please check that the storage is not empty; i.e., it contains at least one certificate with a private key. You need a certificate with a private key to sign the …

When I open a signed document with Acrobat, it says that the 'EldoS.SecureBlackbox' handler used to create the signature could not be found. What should I do?

Adobe Acrobat identifies the security handler that created the signature by its name. By default, SecureBlackbox creates signatures with the name. However, you c…

Troubleshooting: when you try to sign the data using the certificate contained in Windows (with a non-exportable private key), only the MD5 hash algorithm works, even if you manually specify a SHA* algorithm.

The Windows CryptoAPI doesn't support SHA algorithms for signing by default, so SecureBlackbox reverts to MD5 if the CryptoAPI must be used for signing (this is …

How to Resolve OutOfMemory Errors when Loading Large PDF Documents

You can use these code examples to resolve an out-of-memory exception when loading large PDF documents.

Resolving the Error EElPDFDocumentError: Internal error ElPDFDocument.InsertActualSignatureInformation.2

This entry shows how to resolve the following error: Internal error ElPDFDocument.InsertActualSignatureInformation.2

How do I use timestamping with PDFBlackbox, XMLBlackbox, or PKIBlackbox?

How to use timestamping with PDFBlackbox, XMLBlackbox, or PKIBlackbox.

What is a CDS signature? Does SecureBlackbox support it?

A CDS signature is a signature with a certificate chain that ends up with a root certificate issued by Adobe. The idea is that since Adobe software knows the roo…

How Do I Use Timestamping with PDFBlackbox, XMLBlackbox, or PKIBlackbox?

How to use timestamping with PDFBlackbox, XMLBlackbox, or PKIBlackbox.

How do I Specify the Position of the Visible Signature?

How do I specify position of the visible signature?

Why does my timestamp not show up in Acrobat?

I have timestamped the document, but Acrobat does not show it. Why?

Why does loading a PDF file consume more memory than the size of the file?

Why is memory consumption much larger than the size of the PDF file?

Implementing the PAdES Signing of PDF Documents Using SecureBlackbox

The article describes how to perform the advanced signing of PDF documents according to the PAdES specification using SecureBlackbox.

I have a license for PDFBlackbox. When I open the PDFSigner sample in my IDE, I get an error saying that the TElHTTPSClient component is not installed. Where is the component?

The PDFSigner sample application uses the TElHTTPSClient component, which is not covered by your PDFBlackbox license. For information about time-stamping in your…

Signing invoices for the Spanish government in the factura format

Sample code for signing electronic invoices for the Spanish government in the Factura XML format.