Go Premium for a chance to win a PS4. Enter to Win

x
?
Solved

Encrypt Querystring using CAPICOM?

Posted on 2006-07-13
10
Medium Priority
?
2,166 Views
Last Modified: 2012-06-27
In ASP is it recommended to use CAPICOM (CAPICOM.EncryptedData) to encrypt the URL Querystring?  
0
Comment
Question by:thespiceman
9 Comments
 
LVL 31

Expert Comment

by:alorentz
ID: 17101581
What's the point?  Why do you need to encrypt?
0
 
LVL 20

Expert Comment

by:jitganguly
ID: 17101831
If you really want to encrypt use POST method. These days hackers can break anything with the URL. POST is very secured and it only breaks when they hack the whole website.
0
 

Author Comment

by:thespiceman
ID: 17101853
I recently encrypted the querystring using the Vernam Encryption technique http://www.4guysfromrolla.com/webtech/012000-1.shtml.  This was done to prevent altering parameters in the querystring which was allowing the user to view products that were not yet released to the public. Works great...BUT...my manager wants to replace the Encrypt() and Decrypt() functions with the following ones that we use for encrypting data stored in our cookies.  I need to know if this is as secure as the Encrypt() and Decrypt() functions and methodolgy described in http://www.4guysfromrolla.com/webtech/012000-1.shtml?

function Encrypt(val)
      On Error resume next
      err.Clear
      set message = server.CreateObject("CAPICOM.EncryptedData")
      message.Content = val
      message.SetSecret MSCSSite.DisplayName

      message.Algorithm.Name = 1 'CAPICOM_ENCRYPTION_ALGORITHM_RC4

      'Encrypt the message storing the result in the encryptedmessage string
      Encrypt = message.Encrypt
      
      if err.number <> 0 then
            Encrypt = val
      end if

      ' Release the EncryptedData object.
      Set message = Nothing

end function

function Decrypt(val)
      On Error resume next
      err.Clear
      set message = server.CreateObject("CAPICOM.EncryptedData")

      ' If a message was read in (the length of the input string is
      ' greater than 0), set the password and decrypt the message.
      If Len(val) > 0 Then
            message.SetSecret MSCSSite.DisplayName
          message.Decrypt val
          Decrypt = message.Content         
            if err.number <> 0 then
                  Decrypt = val & "_ERR"
            end if
      Else
            Decrypt = val
      End If

      Set message = Nothing
end function
0
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.

 
LVL 20

Expert Comment

by:jitganguly
ID: 17101932
Well what kind of encryption technology is used in CAPICOM ? Is that better than the one you currenlty use ? Go though their technical review.
But all these 3rd part tools are better than standard encrytion through VBScript. Iuse this simple VBScript stuff, but I am sure these guys use much better than this

Function P2E(myPass)
Dim i

    P2E = ""
    For i = 1 To Len(myPass)
        P2E = P2E & Chr(Asc(Mid(myPass, i, 1)) + i)
    Next

End Function


Function E2P(myPass)
Dim i

    E2P = ""
    For i = 1 To Len(myPass)
        If Asc(Mid(myPass, i, 1)) > 32 Then
           'Response.Write Mid(myPass, i, 1) & " - " & chr(Asc(Mid(myPass, i, 1))-i+1)& "<br>"
           E2P = E2P & Chr(Asc(Mid(myPass, i, 1)) - i)
        End If
   Next
End Function
0
 
LVL 14

Expert Comment

by:CyrexCore2k
ID: 17103380
"If you really want to encrypt use POST method. These days hackers can break anything with the URL. POST is very secured and it only breaks when they hack the whole website."

Um, that's completely incorrect. I'm not trying to be rude or anything but hackers can break anything using the POST method just as easily as a query string.
0
 
LVL 14

Expert Comment

by:CyrexCore2k
ID: 17103506
Using a packet sniffer it would take about the same amount of time. Look the point is that your statement "POST is very secured" is not only wrong but dangerously misleading. Normally I don't say anything when experts make mistakes but I felt that telling someone that POST is somehow secure could lead someone to design a site with deadly security flaws.
0
 
LVL 14

Assisted Solution

by:CyrexCore2k
CyrexCore2k earned 1400 total points
ID: 17105390
thespice - Sorry to get of track.

Since I don't know exactly how CAPICOM encrypts strings I can't say for sure. But personally I would trust it. It's not a very complicated encryption task and if it's been working for your cookies it should work fine for your query strings. If you really want to know for sure I would do away with CAPICOM altogether and encrypt is using an RC4 algorithm since 1) it's industry standard  2) you can see the source code and best of all 3) it's free.
0
 
LVL 25

Accepted Solution

by:
kevp75 earned 600 total points
ID: 17105407
0
 
LVL 7

Expert Comment

by:SimonBlake
ID: 17107465
thespice - I've done some work with RC4 and encryption before - one of the holes you might fall foul of is the MS implementation of URL encoding (This issue is also present on Oracle's web server as well) in that null bytes (hex 00) don't get encoded correctly, so when you try to decode at the other end it gives a different result.

My advise to you is to use a custom url encoder ontop of the encryption at both ends regardless of form or query string data otherwise you will be scratching your head for hours!

S.
0

Featured Post

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!

Question has a verified solution.

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

I have helped a lot of people on EE with their coding sources and have enjoyed near about every minute of it. Sometimes it can get a little tedious but it is always a challenge and the one thing that I always say is:   The Exchange of informatio…
Hello, all! I just recently started using Microsoft's IIS 7.5 within Windows 7, as I just downloaded and installed the 90 day trial of Windows 7. (Got to love Microsoft for allowing 90 days) The main reason for downloading and testing Windows 7 is t…
Please read the paragraph below before following the instructions in the video — there are important caveats in the paragraph that I did not mention in the video. If your PaperPort 12 or PaperPort 14 is failing to start, or crashing, or hanging, …
When cloud platforms entered the scene, users and companies jumped on board to take advantage of the many benefits, like the ability to work and connect with company information from various locations. What many didn't foresee was the increased risk…
Suggested Courses

783 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