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                      AutoSoft Systems
        AutoSoft Systems 2 Round Hill Court
        East Greenwich, RI 02818
        401.885.3631
        401.884.5653 Fax
                        401.996.3631 Cell
AMDG       Decision Ready Information! autosoft@aol.com
Commercial & custom multi-user computer software for a variety of applications including performance metrics, statistical analysis, data extraction and merger from multiple large databases, computer simulation and management information systems.  Founded in 1982.
We know Excel! Whenever possible, Excel is the user interface, VBA is the programming language, ODBC connects to the database of your choice.
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                            AMDG
How To Secure An Excel Application
Excel is an incredibly flexible and powerful tool.  There are some legitamite concerns about securing and validating Excel documents which can be addressed simply and quickly.  Here are features I have employed in the past to do so:
                             
 
Password Protection - one can protect an Excel document at 3 different levels:
    - Workbook level protection
    - Worksheet level protection
    - Visual Basic Code protection
    As a further safeguard, once an Excel application has been fully validated or verified, one can make a copy of the workbook, then create a random password, protect the copy with the random password, then discard the password.  By doing this, the document is fully protected, and this working copy, which is then distributed, cannot be unprotected for unauthorized modifications because NOBODY knows the password.  Of course, the master copy, which is not password protected, or protected with a password known to authorized individuals, is kept in a secure location.
   
                             
  Remove Default Commands from the Excel Ribbon
    A programmer has the ability to edit the XML code of an Excel workbook and strip off the default Excel ribbons, replacing it with a Ribbon that only has the desired commands.  Here are two examples of such a practice:
     
- Project Portfolio Manager
           
      - MATRIX - Database of Databases            
                             
  Lock or Hide cells that contain equations, only allowing users to edit certain cells
   
One has the ability to include in the Cell's formatting properties a LOCK, which restricts users from editing or optionally even selecting a locked cell.
                             
                             
                             
                             
                             
                             
                             
                             
                             
  Hide some of the worksheets in a workbook:
   
One has the ability to hide worksheets at two different levels (Hidden and Very Hidden).  Here is the screen shot from the VBA Shell indicating the 3 options for a worksheet.
                  Is the "Very Hidden" option sort of like "Double Secret Probation"?      
                             
                             
                             
                             
                             
  Use Data Validation to assure the user only enters valid choices on text entry fields.
                             
    Illustration of a Drop Down Box in a cell:
 
         
 
           
    Illustration of contraints that can be placed on a cell:  
           
           
         
       
    The Data Validation Control:        
                 
                             
                             
                             
 
Use a VBA Form with a text box that has as Masked Password
                             
                             
                             
                             
                             
                             
                             
                             
Data Encryption
                             
I have many ways of encrypting data at all levels.  Here is a screen shot of a simple password encryptor:
         
 
                 
  In this example, the password "Welcome@123" is encrypted in the long string of numbers.                    
                     
                     
                     
                     
                     
                     
                     
                     
                     
                             
                             
Payroll is a particularly sensitive topic at many companies.  This screen shot, from a back end Access database used by a multi-user application, illustrates how Payroll information is encrypted at the field level inside the Payroll table of the database, so that even if a nefarious person obtained a copy of the Access database, confidential information is not compromised.
                             
                             
                             
                             
                             
                             
                             
                             
                             
                             
                             
                             
                             
                             
                             
                             
                             
                             
                             
                             
                             
                             
                             
                             
                             
                             
                             
                             
                             
                             
                             
                               
AutoSoft Systems | 2 Round Hill Court, East Greenwich, Rhode Island, USA 02818 | 401.885.3631 | Fax: 401.884.5653 | Mobile: 401.996.3631 
This web page was last updated at 05/04/2018 08:33 AM and is written in EXCEL!
AXIOM is a Trademark of Consona - USYS is a Trademark of Zumbach - AutoSoft Systems is not affiliated with Consona nor Zumbach