Visual Basic, Saving "Encrypted" Data

Saving "Encrypted" Data

Author	Message
Matthew Jon Ha #1 / 4	Saving "Encrypted" Data What's the easiest way to save data to a file so that it's somewhat difficult to edit. In other words, I just want to be able to save data to a file so that it can't be editted with a text editor. I was considering encoding by playing with the bits of each byte but that seems to be difficult with VB. Also, is there a quick explanation of how to write code in C/C++ and then put it in a DLL? Or should I break down and buy a book? :) Thanks.
Fri, 19 Sep 1997 03:00:00 GMT

Jeff Eva #2 / 4	Saving "Encrypted" Data Quote: >What's the easiest way to save data to a file so that it's somewhat >difficult to edit. In other words, I just want to be able to save >data to a file so that it can't be editted with a text editor. I was >considering encoding by playing with the bits of each byte but that >seems to be difficult with VB. There are a few files available, one is called crypt.zip (available at ftp.cica.indiana.edu/pub/win3/programming/vbasic). It is a simple .bas file with a function that encrypts anything you send into it. Quote: >Also, is there a quick explanation of how to write code in C/C++ and >then put it in a DLL? Or should I break down and buy a book? :) A quick explination.... I've read hundreds (well, 5) FAQ's on it, about 20 pages from my Turbo C book, and I still can't get a DLL to work without a memory error. If anyone knows how, could you send me some code? I think you have to define the function as: int FAR Pascal _export functname (...) Jeff. -- Jeff Evans http://www-bprc.mps.ohio-state.edu/cgi-bin/hpp/home.html
Sat, 20 Sep 1997 03:00:00 GMT

Terry Butterfiel #3 / 4	Saving "Encrypted" Data Quote: > What's the easiest way to save data to a file so that it's somewhat > difficult to edit. In other words, I just want to be able to save > data to a file so that it can't be editted with a text editor. I was > considering encoding by playing with the bits of each byte but that > seems to be difficult with VB. > Also, is there a quick explanation of how to write code in C/C++ and > then put it in a DLL? Or should I break down and buy a book? :) > Thanks. The easiest to do (and break) encryption is to do an exclusive or on the data just before you write it. When you read it, the first thing you do is an exclusive or again and its back (Note: the value you XOR it with _must_ be the same both times.) BTW, haven't tried this in VB but it works well in C
Mon, 22 Sep 1997 03:00:00 GMT

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