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-
-
-
- -=> Coder <=-
-
- v2.0
-
- John Curtis
-
- July 16, 1991
-
-
-
- ** GENERAL **
-
- Coder is an encryption program which will encode an ASCII
- file making it unreadable to all except who has the proper pass-
- code. The use for such a program? Perhaps you keep a personal
- journal on your computer which may contain items of a very per-
- sonal or embarrassing nature. Maybe you have a need for truly
- 'private' E-Mail. In general, any item you wish to remain pri-
- vate or share only with selected others. Who knows who could be
- feeling around through your computer when you are not around.
-
-
- ** THEORY OF OPERATION **
-
- Coder uses a fairly sophisticated encryption method. As
- each character is encoded the following variables are
- considered:
-
- - the length of the line
- - the position of the character in that line
- - the line number
- - the assigned password
-
-
- ** CODER2 **
-
- This version fixes the bug that would cause Coder to fail on
- some files. Added complete command line control to insure
- quick and reliable operation. Basicly this program has been
- nearly completely rewritten.
-
-
- ** USE **
-
- The syntax to invoke CDR2 is as follows:
-
- A>CDR mode filename.ext password
-
- The available modes are: ENCODE and DECODE.
- Passwords are NOT case sensitive.
-
- Examples:
-
- A>CDR ENCODE MYFILE.TXT MYPASS
- A>CDR DECODE MYFILE.TXT MYPASS
-
- NOT acceptable:
-
- A>CDR ENCODE B:MYFILE.TXT MYPASS
- * This will result in the loss of your file!
-
- Wildcards are also unacceptable.
-
- Entering CDR alone on the command line will display a help
- menu.
-
-
- ** PASSWORDS **
-
- ** IF YOU LOOSE OR FORGET YOUR PASSWORD YOU MAY BE S.O.L.. YOU
- WILL BE UNABLE TO RECOVER YOUR FILE. So use a password you can
- remember or write it down some where in a covert manner.
-
-
- ** DECODING **
-
- Enter the DECODE command and your password then the encoded
- file will be replaced with the original information. If by
- chance you enter the wrong password and realize it after the
- decoding starts not to worry. Let the process finish, ENCODE
- the file with the same wrong password, then DECODE with the
- proper password.
-
-
- ** MULTIPLE ENCODING **
-
- It is possible to encode a file more than once, with the
- same password or with different passwords. This of course will
- increase the security of the file but it also will increase the
- complexity of decoding the file. It must be decoded in the EXACT
- reverse of the way it was encoded.
-
-
- ** CODER2.LBR **
-
- Contains:
- CDR2.COM -the compiled program
- CDR2.DOC -this file
- CDR2.BAS -source code
-
-
- I hope this program fulfills that paranoid need in your life
- as it has mine! -JLC
-
-
-