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SCRAMBLE.STX
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1990-03-05
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Screenfile SCRAMBLE.SCN Screen# 01
In this section of the documentation we will look at how to initiate data
encryption. This is OPTIONAL and is only necessary if your computer is
officially used by people who are not authorised to see payroll information, or
if your computer is kept in an unlocked office where it might be used
unofficially after hours by people working overtime.
These procedures need only be done once per employee file to start the
encryption process, after that it will be maintained automatically. However,
for encryption to be maintained you must have already set up your own employee
file (as opposed to testing PAYROLL USA with Anthistle Systems test employee
file, otherwise when the test files are deleted the data encryption will stop
and you will need to repeat this procedure with your own employees to restart
it).
First start PAYUSA in the normal way and if multiple configuration files exist
select the one you wish to initiate encryption on. The above main menu will
then appear. Select choice "F6 DOCUMENTATION / SLIDE SHOW / DOS SHELL"
Screenfile SCRAMBLE.SCN Screen# 02
When the above sub menu appears take choice "F4 SHELL TO DOS (TO EXECUTE DOS
COMMANDS)"
Screenfile SCRAMBLE.SCN Screen# 03
Insert the first of our two distribution diskettes in drive A: and do a
directory to verify that SCRAMBLE.EXE is on the diskette. Your screen will now
look something like the above except your DOS copyright notice may look
different, the drive letter in your DOS prompt may be C: instead of D: and the
contents of the diskette directory may be different. If you have the trial
version then SCRAMBLE.EXE may even be missing as for marketing reasons the
trial has to fit on no more than 2 diskettes and we may be short on diskette
space necessitating the omission of non essential or little used programs. (If
so, you will receive any missing programs when you become a Registered User.)
If SCRAMBLE.EXE is NOT on the distribution diskette then just type EXIT and
press Enter to return to the PAYUSA menu.
If SCRAMBLE.EXE is on the distribution diskette type A:\SCRAMBLE ENC and press
Enter. Note the parameter " ENC" after the name of the program, this is to
tell SCRAMBLE to ENCrypt the files. Note also we are not changing the active
drive, we are including the path (A:\) to the program as a prefix to its name.
DOS 3.xx or greater may be required for this method of running the program to
work. We need to keep the hard disk the active drive because when SCRAMBLE
starts it will look for the PAYUSA.CNF configuration file on the active
directory, which in turn tells it where to find the data that is to be
encrypted. You can easily check which version of DOS you are using by typing
VER at the DOS prompt and pressing Enter.
Screenfile SCRAMBLE.SCN Screen# 04
SCRAMBLE will then encrypt the input data directory (which may be different to
the D:\PAYIN\ shown in the above example).
Screenfile SCRAMBLE.SCN Screen# 05
SCRAMBLE will then encrypt the output data directory (which may be different to
the D:\PAYOUT\ shown in the above example).
Screenfile SCRAMBLE.SCN Screen# 06
When SCRAMBLE returns to the DOS Prompt simply type EXIT and press enter to
return to the PAYUSA menu.
Screenfile SCRAMBLE.SCN Screen# 07
Then press Esc to exit the sub menu and return to the main menu.
Screenfile SCRAMBLE.SCN Screen# 08
And from the main menu press F7 or Esc to exit back to DOS. Do not make any
other selections from the menu yet. First we have to go back to DOS and restart
PAYUSA so it can detect that it is dealing with encrypted files.
This completes the one time start up procedure for using encrypted files. The
next part of this section shows how encryption is automatically maintained,
followed by a final part that shows how to discontinue encryption.
Screenfile SCRAMBLE.SCN Screen# 09
Start up PAYUSA again in the normal way.
Screenfile SCRAMBLE.SCN Screen# 10
PAYUSA will detect the encrypted files and display the above screen. This and
the following two screens will be seen each time you use PAYUSA with encrypted
files
Screenfile SCRAMBLE.SCN Screen# 11
SCRAMBLE un-encrypts the encrypted files on the input directory. The last
character of the encrypted file name extension will be a graphic character.
Screenfile SCRAMBLE.SCN Screen# 12
Then SCRAMBLE un-encrypts the encrypted files on the output directory. The last
character of the encrypted file name extension will be a graphic character.
Screenfile SCRAMBLE.SCN Screen# 13
Then the main PAYUSA menu appears. Now you can make any choice and run your
payroll in the normal way.
Screenfile SCRAMBLE.SCN Screen# 14
When you are finished with your payroll session and exit from the main PAYUSA
menu then PAYUSA will display the above screen.
Screenfile SCRAMBLE.SCN Screen# 15
Then SCRAMBLE will encrypt the input directory
Screenfile SCRAMBLE.SCN Screen# 16
Then SCRAMBLE will encrypt the output directory, your data is now safe if you
lock up the diskette containing SCRAMBLE.EXE in a desk drawer or in your safe.
SCRAMBLE.EXE can also be used to encrypt and decrypt other sensitive files of
any type on your computer. Run it as a stand alone program from the DOS prompt
with no parameters to see information on how to do this, and to see the
restrictions and limitations of Anthistle Systems & Programming Ltd. liability
concerning its use.
This concludes the documentation of automatic detection and handling of
encrypted payroll files. In the remaining screens of this section we will see
how to discontinue automatic us of SCRAMBLE.
Screenfile SCRAMBLE.SCN Screen# 17
If you decide to discontinue data encryption it must be done directly from the
DOS prompt for the data directories concerned, rather than in a DOS SHELL
started from PAYUSA (because we have to defeat the automatic detection
procedure before it begins, and it would already have begun if PAYUSA had been
started). If you have only one set of employee files the data directories will
most likely be \PAYIN and \PAYOUT (our defaults). If you have multiple
configuration files and the one you want is started by selecting the SMITH.CNF
configuration then the data directories are most likely \SMITH\PAYIN and
\SMITH\PAYOUT . You can test this by doing a directory from the DOS prompt,
example DIR \PAYIN or DIR \SMITH\PAYIN and the files will be listed on the
screen. If they are encrypted files the last character of the filename
extension will be a graphic character.
Screenfile SCRAMBLE.SCN Screen# 18
Insert your diskette containing SCRAMBLE.EXE in drive A: then change directory
to the hard drive input payroll data directory, done in the above example with
CD \PAYIN . Then type DIR and press enter to verify that the files listed are
the ones you expect. If everything looks good, type A:\SCRAMBLE DEC and press
enter. Note the active directory is the hard disk data directory, and we are
executing SCRAMBLE from drive A: by prefixing its name with the path to where
it resides (DOS 3.xx may be required to do this). Note also the parameter
" DEC" after the program name, this tells SCRAMBLE to DECrypt the directory.
Screenfile SCRAMBLE.SCN Screen# 19
Because it cannot find the configuration file, SCRAMBLE does not know if it is
processing payroll data or not. If we reply Y it will not decrypt the files
but instead will display instructions for the normal use with payroll. This is
not normal use, so we lie a little and reply N so it thinks these are not
payroll files.
Screenfile SCRAMBLE.SCN Screen# 20
SCRAMBLE will display the file names and ask if it is OK to proceed. Now we can
reply Y and the files will be decrypted (unscrambled).
Screenfile SCRAMBLE.SCN Screen# 21
The files will be listed one by one as they are decrypted, then when they are
all done SCRAMBLE will terminate and return you to DOS.
Screenfile SCRAMBLE.SCN Screen# 22
Now we change directory to the output directory, in this example done with
CD \PAYOUT , then we repeat exactly the same steps we did with the input
directory.
Screenfile SCRAMBLE.SCN Screen# 23
Lie a little and reply N again on the above screen.
Screenfile SCRAMBLE.SCN Screen# 24
Reply Y on the above screen.
Screenfile SCRAMBLE.SCN Screen# 25
And the output files are listed as they are decrypted.
Screenfile SCRAMBLE.SCN Screen# 26
If at this point you do a directory display of the input and output directories
then you will see that the last character of the filename extension is now back
to normal (no longer a graphic) indicating that the file is no longer
encrypted. Providing there are no encrypted files on either the input or on the
output directories then the next time you use PAYUSA you will no longer be
asked for the SCRAMBLE.EXE diskette when accessing these employees.