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CRYPT, Ver. 1.0 (c) 1993
EFD Systems, All Rights Reserved
CRYPT is a simple file encryption utility designed to produce reasonably secure
documents which can only be read using TXTBook or GRFBook. To use CRYPT, type:
CRYPT filename [password] /T or /G
Example: CRYPT yourfile gobbldygook /T
"Password" is an optional user specified character string of 16 characters or
less. A default password is built-in; however, security is greatly enhanced if
a password known only to the document's author is specified. Either /T or /G
must be specified to indicate that the encrypted file will be used with either
(T)XTBook or (G)RFBook. Encrypted output is written to either "filename.CRT"
(TXTBook file) or "filename.CRG" (GRFBook file). A small index file,
"filename.NDX", is also produced as output. This index file is less than 3k in
size, typically much less. The encrypted text file and it's index must always
be distributed as a pair if the text is to be properly de-crypted and displayed
on the screen. This file pair can be renamed as you see fit; however, text file
and index must always share the same name, varying only by file extension. The
index file must always carry a .NDX extension.