
                                  USER MANUAL




                                       i
                              TENCODE and TDECODE

TENCODE.BAT is the batch file used to encode text files in the *ONETIME* file 
security package.  Using TENCODE is the easiest way to encode text files. To 
invoke, type: tencode filename, where filename is the name of the file to 
encode.  For example to encode the file letter.txt, type: tencode letter.txt 
and an encoded file named ENCR.XXX will be created.  ENCR.XXX will be in the 
form of groups of five alphabetical characters, the traditional form of 
encoded text.  This file, ENCR.XXX, is suitable for printing out as hard 
copy, for faxing, or for viewing with a text file viewer.

TDECODE.BAT is the batch file used to decode text files previously encrypted 
by TENCODE.BAT.  The encrypted file will (must!) have the name ENCR.XXX.  To 
decode the file, simply type: TDECODE and the decoded file DECR.TXT will be 
created. Note that digits and most punctuation will be rendered as their 
literal equivalent, such as five for 5 and exclamationpoint for !.  Note that 
the decoded file will lack word spacing making it somewhat awkward to read.  
FENCODE and FDECODE (see below) overcome these difficulties, but at the 
price of the encrypted file not being suitable for hard-copy. 

TENCODE.BAT invokes the executables CVT.COM to convert digits and most 
punctuation in the target file to their literal equivalents.  It invokes 
fcr.com, a code-key generator, to create a file of random numbers defining 
the alphabetical "shift" of each character in the file to be encoded.

                                    ii
                           FENCODE and FDECODE

FENCODE.BAT is the batch file used to encode both binary and text files in 
the *ONETIME* file security package. Using FENCODE is the easiest and most 
flexible way to encode files of all types, including .COM, .EXE, .GIF, and 
other binary files. To invoke, type: fencode filename, where filename is the 
name of the file to encode. For example to encode the file picture.gif, 
type: fencode picture.gif and an encoded file named ENCR.XXX will be created. 
ENCR.XXX will be in the form of binary characters, not suitable for printing 
out as hard copy, for faxing, or for viewing with a text file viewer, but 
totally usable for storing on magnetic media or for transmission by modem. 

FDECODE.BAT is the batch file used to decode binary or text files previously 
encrypted by FENCODE.BAT. The encrypted file will (must!) have the name 
ENCR.XXX. To decode the file, simply type: FDECODE and the decoded file 
DECR.TXT will be created. The decoded file DECR.TXT will be the exact image 
of the original file encoded with FENCODE. If it was originally an 
executable file, rename it to its original .EXE or .COM name and it will 
execute as before. GIF and WK1 and other special format binary files will 
retain their full original functionality when the DECR.TXT file is renamed 
to the original form. 

                                     iii
                                     ZDEL

ZDEL.EXE is a "file-shredder".  It deletes files in such a manner that no 
information can be recovered from them by any special purpose utilities or 
software tools.  The file to be wiped out is first overwritten, character by 
character, by the letter Z.  To invoke, type: zdel filename, where filename 
is the name of the file to be wiped out.  More information on this utility is 
included in the file ZDEL.DOC.





                               SHAREWARE NOTICE

This is a preliminary shareware version of the *ONETIME* file security 
package.  The code has much room for improvement, both in ease of use and 
speed, and the documentation is scanty.  To the best of my knowledge there 
are no major bugs, but in any case future versions of this package will show 
great improvement, IF...  there is sufficient interest shown by you, the 
users, in this package. 

If used correctly, the "onetime" system is theoretically unbreakable, even by 
the supercomputers used by government agencies.  This certainly makes it more 
secure than the cyphers conforming to the so-called DES standard promulgated 
by the Bureau of Standards.  

I ask a very modest $3.00 contribution to register this version 1.0 of 
*ONETIME*.  Registration gets you the next update free as well as a 
reasonable amount of technical consultation, by mail, on encryption problems 
and techniques using this software.



                                   DISCLAIMER

I, the author, will not be responsible for any damages, actual or incidental 
caused by use of the *ONETIME* file security package.  If you, as a 
registered user, are dissatisfied with any aspect of it, I will without 
question refund the full $3.00 registration fee, if desired. This is the 
full extent of my responsibility. 

Any unlawful or immoral use of the *ONETIME* file security package is 
strictly prohibited.  This software is intended for use by honest, law 
abiding persons only for uses such as keeping business data files 
confidential, for keeping data files on networked computers secure from 
fellow users, etc.  Of course, I the author, cannot be responsible for misuse 
of this software by irresponsible individuals, but I am confident that the 
vast majority of *ONETIME* users are persons governed by common sense and 
honesty.



M\Cooper
109 Polk St., *3*
Cumberland, MD 21502-2317

