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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Clients say:

We started with few knowledge to digital signing, but with the help of the documentation, the samples and the very excellent support of EldoS we reached our goal very fast.

Latest version

Release:  15.1.304
23 May 2017

Pre-release:  16.0.303
21 May 2017

MailBlackbox package of SecureBlackbox®

SecureBlackbox product diagram

With MailBlackbox you can easily compose, parse, send and receive e-mail. Both SMTP, POP3 and IMAP protocols supported by MailBlackbox can run over secured SSL/TLS connection to protect confidentiality of your e-mail. IMAP is supported since SecureBlackbox 13.

MailBlackbox provides e-mail composition and parsing components that handle RFC 822 and also MIME, S/MIME and PGP/MIME e-mail using MIMEBlackbox package.

As SSL/TLS connection is used, MailBlackbox includes components that provide authentic implementation of generic SSL/TLS transport.

Another benefit of SSL/TLS is that PKI infrastructure used in SSL/TLS for authentication is a widely-used technology, so implementation and maintenance of SSL/TLS-based solutions are quite simple tasks. For certificate creation, management and validation MailBlackbox uses PKIBlackbox, base functions of which are included with MailBlackbox package.

To fight spam MailBlackbox supports DKIM and DomainKeys technologies.

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 MailBlackbox (.NET edition)
Read about MailBlackbox (VCL edition)
Read about MailBlackbox (Java edition)
Read about MailBlackbox (C++ edition)
Read about MailBlackbox (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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