MarpX Privacy

Set Up to Share Confidential Matters

  1. Share privately with a would-be confidant
  2. Name of a confidant
  3. Short name
  4. Date(s) in a roster entry
  5. The Extreme Encryption option
  6. confidant code for a confidant
  7. Go to your roster page

Pick a confidant, share some information privately

Let's use the word confidant for anyone with whom you set up to exchange information confidentially. Get in touch with your prospective confidant in a way that eavesdroppers or hackers cannot find out what's going on. The average computer hacker is not likely to listen in on a telephone call, or detect what you say face to face, or intercept your mail. Pick some way that strikes you both as secure. Together come up with a seven character confidant code, made up of any combination oa A-Z (capital letters), a-z (lower case letters), 0-9 (numeric digits). You are each going to enter the other's name, plus initials or a short name, and this confidant code in a roster, that is, a list of confidants in your copy of the MarpxPrivacy program.


A confidant relationship does not have to be restricted to just two people. More can meet or share the same points below. Caution: If a group gets too large, there is greater risk of someone revealing the all-important confidant code.

Name of a confidant

Later, when you go to encrypt or decrypt content with a confidant, you need to select that person's name from a list (here called a roster). That list displays names in alphabetic order, followed usually by the start date of the confidant relationship. If this setup is for you and one other person, you simply need the other person's name. If this is for sharing among a group of people, you need to agree upon a name for the group or team or department or whatever.


Names have to be displayed in order to select one for exchanging information. Therefore, names are treated as public.

Short name

When you are in keyless mode, initials or a three character short name followed by an underscore are inserted at the beginning of file names. The three characters may be either letters or numeric digits. They are used at the beginning of message file names. If preferences are set, the same three characters and underscore are prefixed to the names of files that are being encrypted.


If you create a new entry for a person or group already in your roster, a different short name would help to identify which roster entry was used to encrypt a file. For example, "SBT" might in a later entry be replaced by "ST1" or "ST2".


Short names may be treated as public information, in which case they are shown as part of the roster display.

Date(s) in a roster entry

MarpxPrivacy usually fills in the current date for a new roster entry in the international yyyy/mm/dd format. You are free to change it to a different format or to a different date if that makes sense for you. The main reason for the date is so that you can distinguish between two or more entries for the same relationship, but for different time periods. There's more about this in the page on editing a roster entry.


These dates can be treated as public information.

The Extreme Encryption option

If your confidential exchange is to be protected by Extreme Encryption, you each need access to the same Private Key Expander (PKE) purchased from It has to be unencrypted when you first reference it; the program will encrypt it for your security after you have added the name of a PKE within a new roster entry.


Each Private Key Expander must be used for no more than one confidant relationship. Otherwise the program will try to encrypt the PKE file in two different ways, and it will no longer work.

confidant code for a confidant

The confidant code must be kept totally secret between the two persons or among the team in that confidant relationship. Agreement is needed (privately!) on a seven character code chosen from among capital letters A to Z, lower case letters a to z, and digits 0 to 9. Don't make it simple! ... something like "b8Tfo9S" is much better than "OurCode".


Did we mention that confidant codes should be kept secret?

Go to your roster page

Each confidant needs to launch MarpxPrivacy in "Keyless Mode" mode. (Remember to input your personal ID code.) When you click on Keyless Mode, you are shown your roster to date and a row of buttons that allow you to do things with that list.



With the above information in hand, you are ready to click on the Add New Entry button.


MarpX Privacy