Solved

Encrypt String!

Posted on 2000-03-13
6
355 Views
Last Modified: 2010-04-04
How to SIMPLY encrypt/decrypt strings in Memo1 when the user is saving/loading the file?
0
Comment
Question by:pipigril
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
6 Comments
 

Author Comment

by:pipigril
ID: 2612622
I forget to say that the file is in "plain text" format.
0
 
LVL 5

Expert Comment

by:TheNeil
ID: 2612659
Just do this to input the data:

AssignFile(data_in, <Filename>);
Reset(data_in);
Memo1.Lines.Clear;
WHILE NOT(EOF(data_in))
DO
BEGIN
  READLN(data_in, sTemp);
  sTemp := DecodeStr(sTemp);
  Memo1.Lines.Add(sTemp);
END;
CloseFile(data_in);

And then to output the data:

AssignFile(data_out, <Filename>);
Rewrite(data_out);
FOR iCount := 0 TO (memo1.Lines.Count - 1)
DO
BEGIN
  sTemp := Memo1.Lines[iCount];
  sTemp := DecodeStr(sTemp);
  WRITELN(data_out, sTemp);
END;
CloseFile(data_out);

You'll need to create an encode and a decode routine which have a strings passed to them and then either encode or decode them. Writing these depends on how secure you want to make them. If you want help with these then just ask

The Neil
0
 
LVL 1

Expert Comment

by:umulig
ID: 2612737
You can find a lot of this stuff on WWW.TORRY.RU

Regards
Umulig
0
Technology Partners: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

 
LVL 2

Accepted Solution

by:
Serega earned 200 total points
ID: 2613198
There is no case what text format you are using.
You should to decode and encode whole memo text, for example as following:
// simple coding
// encoding and saving to file
var str: String;
    i:integer;
begin
     str := Memo1.Text;
     for i:=1 to length(str) do                {for all characters in string }
       str[i] := chr(ord(str[i]) xor 123);   {code character}
     Memo1.Text := str;
     Memo1.Lines.SaveToFile('e:\temp\file.txt');
     Memo1.Clear;
end;

With that coding, decoding procedure will be the same.
0
 
LVL 13

Expert Comment

by:Epsylon
ID: 2613373
0
 
LVL 13

Expert Comment

by:Epsylon
ID: 2619321
0

Featured Post

What does it mean to be "Always On"?

Is your cloud always on? With an Always On cloud you won't have to worry about downtime for maintenance or software application code updates, ensuring that your bottom line isn't affected.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

The uses clause is one of those things that just tends to grow and grow. Most of the time this is in the main form, as it's from this form that all others are called. If you have a big application (including many forms), the uses clause in the in…
Introduction Raise your hands if you were as upset with FireMonkey as I was when I discovered that there was no TListview.  I use TListView in almost all of my applications I've written, and I was not going to compromise by resorting to TStringGrid…
Monitoring a network: how to monitor network services and why? Michael Kulchisky, MCSE, MCSA, MCP, VTSP, VSP, CCSP outlines the philosophy behind service monitoring and why a handshake validation is critical in network monitoring. Software utilized …
Visualize your data even better in Access queries. Given a date and a value, this lesson shows how to compare that value with the previous value, calculate the difference, and display a circle if the value is the same, an up triangle if it increased…
Suggested Courses
Course of the Month8 days, 21 hours left to enroll

615 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question