Tour of Privacy

  1. Getting started:
  2. Launch the program when it is on a flash drive:
  3. Launch the program when installed on a PC:
  4. The Home Page:
  5. If you click on the Encrypt Msg button, you will see:
  6. The message becomes an encrypted file:
  7. The message also becomes unrecognizable text:
  8. The Decrypt Message page:
  9. Encrypt a File:
  10. Decrypt a File:
  11. Are the original and the decrypted file the same?:

Getting started:

If you have not already reviewed the list of best practices, read and carry out these three items:

  1. Choose the Windows PC (personal computer) that you will use to encrypt and to decrypt your content.
  2. Make your choice whether or not to connect that PC to the Internet. (Disconnected is more secure, connected is more convenient.)
  3. Set that computer to show file extensions. Everything below will make more sense if you do.


Launch the program when it is on a flash drive:

Plug the flash drive containing MarpX Good Privacy into a USB port on the Windows PC that you will use to make your files and messages private and to restore the originals. Typically, a pop-up like this shows:



On the pop-up select and click on Open folder to view files. If there is no pop-up, click on the Windows Explorer icon (in Windows 10, the File Explorer icon), then navigate to the flash drive.



Highlight and double click on the GoodPrivacy directory. You will be shown a list of files within the GoodPrivacy directory.



Highlight and double click on MarpxGoodPrivacy.exe. You will be shown the program's home page.


Launch the program when installed on a PC:

Chances are that, if you installed the MarpX Good Privacy program directly on a PC, it created a shortcut on your Windows desk top. If so, just double click it, and the program will start.


No shortcut? Click on the Windows start button (usually at the lower left of your screen), then on "All Programs". Look in the list for Marpex Inc. and within that directory, on MarpxGoodPrivacy. There you will see another MarpxGoodPrivacy with a colored icon beside it. Double click there and the program will be launched.


The shortcut is more convenient. If you don't have one on your desk top, and would like one, you can make it yourself. The trick is to find out where the program has been installed. Right click on a clear portion of your desk top. Select New -- Shortcut. Then browse down. It may be in some odd location like C:\Users\[your name]\AppData\Roaming\Marpex Inc\MarpxGoodPrivacy\MarpxGoodPrivacy.exe. Once it is found and selected, click Next. Name the shortcut (for example, "MarpX Good Privacy" with a space). Click OK.


The Home Page:


MarpX Good Privacy starts at this navigation screen. When in doubt, click the Home button to return here. In this home page, you can switch between handling files and messages. You can also access the help pages (highly recommended) and the Exit button.


If you click on the Encrypt Msg button, you will see:


The large box lets you type in or paste a message that you would like to make private. Next below is an example in which 160 letters have been typed. It could just as easily been copied and pasted from within another file such as a word processor. Keep the length over 50 characters and under about 3000, which is roughly two double space typed pages. The 3500 figure allows extra for the strange things that HTML does to increase the count for some punctuation characters and line ends.



Turn attention now to the small box at the bottom. Keys for encryption by MarpX Good Privacy are always seven letters -- any seven letters you wish. Capital letters are preferred. (If you use lower case letters, the program changes them to capital letters.) You can use the same combination of letters for different messages or files, but it is more secure if you use a different combination. IMPORTANT: IT'S UP TO YOU TO KEEP TRACK OF THE KEYS YOU USE. Paper and pencil is much more secure than making an online log; a hacker who found an online list of content and keys could get at all your content.



In this example, the seven letters WGEZTDP were chosen to privatize this message.


Click the large Encrypt Message button.


The message becomes an encrypted file:


The message is instantly made into a file. The file's location and name is provided as in the above screen. The location is normally in a "MyPrivacy" directory on the same drive as your MarpX Good Privacy program -- usually on your flash drive. The name is "Msg_" followed by a date stamp, and the double suffix ".enc.txt". Notice in the above that the month is included first as a number 01 to 12, then a three letter abbreviation. That way, the messages are listed in time order when you list what is in the MyPrivacy directory. 195508 means 8 seconds after 7:55 p.m. (19:55 in a 24 hour clock) The extension ".enc" means encrypted. The added extension ".txt" means that the entire message has been converted to letters and digits in a format called Base64.


The message also becomes unrecognizable text:


Encrypted messages are wrapped in text, so that they may readily be copied and pasted to email or to social media pages. Files attached to or spread in emails easily get past unfriendly spam filters. The instructions to copy and paste are shown on the page; the steps become second nature quickly.


The first time you run the program, try some experiments.

  1. See if you can make any sense out of the jumble of letters, digits, periods, and exclamation marks that make up an encrypted message. Bet you can't! If you can, you deserve a high paying job with the U.S. National Security Agency.
  2. If you have a Facebook page, write a message for friends. Copy and paste the message into your Facebook page, and phone a couple of friends to tell them the key you used. Ask them to go to the Decrypt Msg page in their copies of MarpX Good Privacy, highlight, copy and paste your Facebook message and enter your key. They will get the message. Mark Zuckerberg and Facebook will not get it.
  3. As an experiment, write a message, then highlight and copy it as in the box above. Then click on the Decrypt Message button at the bottom of the page. More on this experiment below.


The Decrypt Message page:


Let's assume you have highlighted a text-like segment including the <<< and >>> anchors, and you have used CTRL-C to copy it onto the Microsoft "clipboard". The large box on the Decrypt Message page is the place to take it. Click anywhere in the big box, click CTRL-V. It will look like this:



Enter the same code that was used to encrypt it. Click on Decrypt Message.



Decrypted messages are turned into files. Here is the file name and where it is located. Notice the name ... same as the incoming message, except the .enc.txt double suffix has been removed, and the suffix is now ".decrypted.txt". The word ".decrypted" is added so that it does not overwrite the original message, and you can compare the two if you wish. Incidentally, if you would prefer that the name of the decrypted file be the same as the original, you can make that happen by editing the file Preferences.txt which is included among the program files for MarpxGoodPrivacy. Simply find the keyword {AddDecrypted} and change the following Yes to No. When you save Preferences.txt, save it as ordinary text; don't let the word processor add formatting to it.


Click OK.



When you decrypt a message, you are shown the plain text, that is, the original message. (If there were any accented characters or special characters in the message, this step is skipped. But the full message is still in the file named above.)


There is a Home key at the bottom of the page. Click on that, then choose Encrypt File.


Encrypt a File:


Files are even easier to make private. So long as the file is somewhere between 50 bytes and 100,000,000 bytes, this version of MarpX Good Privacy will handle it. (Need something that does gigabyte size files? Contact us.)


Simply browse and select the file you want to make private. Then input below whatever key you want to use this time. (Here we used CEHPPQD.) There is also an option to wrap the encrypted version in text so that it can get through as an email attachment. That's useful, but it makes files up to fifty percent larger. This feature is not used for the 1.5 megabyte file selected here. The screen will look like this:



Click Encrypt This File and you will be shown...



... the location and name of the encrypted file. The name is the same as the input file, but with a file extension .enc added at the end.


You are NOT shown the encrypted file. It's a mess, an absolute jumble of all 256 different characters that can be contained in a computer byte. If you are really interested in technical detail and can tolerate DOS, here is a note on what's in an encrypted file.


Decrypt a File:

To arrive at this next screen, click the Home button and continue this tour by choosing Decrypt File.



Normally you would park the encrypted file in archives or send it to someone else. For this tour, let's simply decrypt the same file that was encrypted above. On the flash drive, browse to MyPrivacy and select assignment7.pdf.enc.



Input the same key, CEHPPQD.



Click Decrypt File. As always, you are shown the location and name of the result. Typically it is found in the MyPrivacy directory. The .enc file extension is gone and the word ".decrypted" appears before the current extension. In this case, it is a PDF (Portable Document Format) file.



Are the original and the decrypted file the same?:

In this example, it's a PDF file...



Here it is, opened with Adobe Acrobat:



Going back to the original file and opening that, it looks exactly the same. In reality, it more than looks the same. It IS the same. More on that in the technical note on what's in an encrypted file. Prove it to yourself with a file that you encrypt and then decrypt.


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