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

Distributed Cryptography Add-on for SecureBlackbox®

SecureBlackbox product diagram

Distributed Cryptography add-on lets you sign server-located documents and data using clients' X.509 certificates without sending the data to the client or transferring the certificate's private key to the server. The add-on can also be used to authenticate the client with the certificate, stored on the client side, with custom server-side validation.

If you have a web application, this is accomplished by placing a client-side browser module (currently we offer Java applet and Java Web Start application or ActiveX control) to the web page. If you have a desktop application or mobile app, SecureBlackbox provides classes and components for the client side as well.

Client-side modules and classes perform the cryptographic operation using certificates located on the client computer without transferring the private key to the server. Server-side data is not sent to the client as well - instead only hash of the data is sent for signing.

Distributed Cryptography add-on is available for licensing as an additional option for Professional, Standard, Data Security, XMLBlackbox, PDFBlackbox, OfficeBlackbox and PKIBlackbox packages.

The licensed version of Distributed Cryptography add-on includes the source code of all client-side modules (Java, ActiveX, Flash) so that you can build your own modules or modify existing ones.

We are working on JavaScript version of the client-side module, and as soon as WebCrypto API provides access to client certificate storages, we will make it possible to use pure JavaScript solution for client-side signing of data and authentication.


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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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