SDC is the Texas based designer, manufacturer and seller of the most secure personal Internet communications applications available!

SDC delivers secure email and secure instant messaging for free without registration or sign up and an unzip only install. No registration or modification of the host PC/laptop is made other than the actual install.

Only SDC delivers secure products that the end users have exclusive control of the creation and distribution of the encryption keys used in securing message contents.

SDC product users have their choice of three different methods to securely exchange and distribute encryption keys.

SDC utilizes NSA Suite B encryption algorithms and key exchange protocols, approved for TOP SECRET, to secure message content and session keys.

There are no Open Source or proprietary encryption or key exchange algorithms used by SDC.

Only SDC products are so secure a hosting computer that is correctly configured can be lost or stolen without creating security risks with regards to the SDC products.

Originally supported platforms on PC and Laptop are Windows 7 SP1 and Windows 8.1 (9600).

When Windows 10 came along it announced itself as a loser OS with its Mandatory updates.

Then Windows 11 came along and became the Microsoft vacuum cleaner of all thats on your computer and simultaneously announced it is no longer 'user friendly'.

With no privacy or security expectaions on Windows a decision has been made by SDC to focus on Linux based security produts.

During the transition time to Linux the SDC Private Email and Private Messenger appilcations will be updated to run on Windows 10 which is why it will be free on Windows.

The SDC Private Email and SDC Private Messenger always used true End to End Encryprtion.

This means only the actual parties desiring to use email or instant messaging securely are able to generate, distribute and protect all data encryption keys.

There is no host server to subscribe to in order to obtain keys and storage from.

Everything exists for the SDC Private Email and SDC Private Messenger on the users computers and is stored encrypted there.

SDC Private Email uses public or private email servers but all text is encrypted along with some of the header.

SDC Private Messenger does not use registered servers to communicate. All communications are direct point to point.

A subscription based server with its key and email and message records that can be sequestered by governments or agencies is not secure.

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SDC HAS THE BEST PRIVACY POLICY AVAILABLE:

SDC DOES NOT SHARE, SELL, SURRENDER OR RETAIN YOUR PERSONALLY IDENTIFIABLE INFORMATION

Your IP address that your browser supplies to every website you visit is never collected or stored in any form for any purpose by SDC.

By implication the foregoing also means you can never receive unsolicited update or product news from SDC so check back from time to time.

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