EldoS | Feel safer!

Software components for data protection, secure storage and transfer


Add perfect security to your application!

SecureBlackbox is a suite of software components that allows developers to add strong security to their applications to protect binary data, files, documents and e-mails.

SecureBlackbox includes authentic implementations (no 3rd-party code used) of various data security standards and network communication protocols for various platforms (Windows, .NET, Linux, macOS / iOS, Java / Android).

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Latest version

Release:  15.1.304
23 May 2017

Pre-release:  16.0.303
21 May 2017

PDFBlackbox package of SecureBlackbox®

SecureBlackbox product diagram

With PDFBlackbox you can complete your PDF generation and processing applications with outstanding security features, such as password-based and certificate-based encryption, certificate-based signing, timestamping and compression of your PDF documents. With PDFBlackbox you can add long-term signatures with timestamping (PAdES standard).

We believe that everybody must do the job he does the best. This is why we leave PDF generation and printing to others and focus on PDF security. You can use whatever PDF library you like for building the document and then use PDFBlackbox for cryptographic operations.

PDFBlackbox supports on-demand data loading and parsing, so processing of large documents does not require large amount of resources.

PDFBlackbox handles documents compliant to PDF versions 1.3 and later.

PDFBlackbox includes own PDF processor and does not use third-party libraries for cryptography operations or for loading or saving PDF documents. To perform cryptographic functions and for PKI operations PDFBlackbox uses PKIBlackbox, base functions of which are included with PDFBlackbox package.

PAdES requires additional license for complete PKIBlackbox package. Also PAdES specification requires collection of external timestamps and complete certificate chain revocation information. This is performed by PDFBlackbox with help of additional SecureBlackbox packages (HTTPBlackbox client and LDAPBlackbox) licensed separately, in AdESBlackbox or as part of larger Professional package.

Top 6 reasons to choose SecureBlackbox:


Strict observance of the standards and the most secure algorithms, used in the industry, ensures highest level of security of the offered solutions.


SecureBlackbox is an integrated suite of instruments, equally applicable for building complex security-related software solutions and for adding data protection to existing applications.

Easy to use architecture

SecureBlackbox was carefully designed by software architects, who have extensive experience in software development and design.

Readiness for use

One can use SecureBlackbox even if he/she has only basic knowledge of information security and cryptography.

Flexible support policy

EldoS offers many support options, from forums and knowlegebase to free individual support and expert services.

Affordable licensing schemes

EldoS offers affordable royalty-free licenses for all its products. All licenses include free individual support and free updates.

Read about PDFBlackbox (.NET edition)
Read about PDFBlackbox (VCL edition)
Read about PDFBlackbox (Java edition)
Read about PDFBlackbox (C++ edition)
Read about PDFBlackbox (PHP edition)


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As of July 15, 2016 EldoS business operates as a division of /n software, inc. For more information, please read the announcement.

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