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Hi All,
Basically, I would like to encrypt the data/file at the client end and should be able to decrypt it at the server side. So that client/end user should not manipulate the auto generated file from the application(window). I've gone through some of the articles from the net and I have found three options to archieve this.
1) Symmetric
Adv: Can encrypt and decrypt using key values.
Disadv: If the end user decode the manage code then it is possible to identify the key values. Then they can also decrypt the file at their end.
2) Asymmetric
Adv: Can encrypt and decrypt using the public and private certificates.
3) Hash algorithum
Add and disadv more or less similar to (1).
So i prefer to go with point (2), i.e Asymmetric. If anyone has better solutions to archieve encryption and decryption of the file then please let me know.
Thanks & Regards,
Shiby Chacko
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hi Shiby
Way 2 is the only way to prevent the Client from decrypting data, but if you go that far that the user will debug your client he´ll be able to intercept the data after generating and before sending. This is a securityhole you can´t close.
If the data you want to send gets larger you should go a middle-way between 1 and 2, because with asymetric encryption you can only encrypt small blocks. (e.g. with rsa 2048 bit you can encrypt 245 byte which will result in 256 encrypted byte). Encrypting with a asymetric algorithm is also slower than a symetric one. The middleway would be then: encrypt everything with a randomly generated symetric key and encrypt only this key asymetric for passing it to the server.
Azraelgod
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Thanks for your response.
Is there any other way to archieve the encryption and decryption of file using manage code with security under consideration.
Regards,
Shiby Chacko
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Hi there!
Well the most secure thing is to use a hybrid of 1 and 2. In this way you close the security hole of disadv of 1 and make the encryption fast(2..is slow).
First of all use Symmetric for the file.
As regards the key, you can use asymmetric encryption, so that the client can never get hold of the key value to decrypt!
You shall have 3 keys..
1...which will encrypt the data (symetric key)
2...private key to encrypt symetric key(1)
3...public key to decrypt symetric key(1)
In this way the client side, does not know that the encrypted symetric key, is really encrypted. So when he/she tries to decrypt, all he gets is garbage!
GaMBiT---> aND ReVeNGe WiLL Be
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Thanks for your response.
Is there any other way to archieve the encryption and decryption of file using manage code with security under consideration.
Regards,
Shiby Chacko
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Is there any way to assign a double click event to a radio button.
I found the ControlStyles bit, but not able to change it on the radiobutton.
Thanks so much in advance.
-Dwayne
*****************
"I know how hard it is for you to put food on your family." —GW
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Unfortunately there is no double click event assigned for radio buttons. You can however create your own radio button control by trying to inherit radio button... maybe (I have never tried to modify standard controls myself).
But why would you assign double click event on a radio button? Radio buttons are to choose between two or more options.
Niklas Henricson
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I am using the radiobuttons as a psudo-menu and the double click would launch the object from the nemu.
I thought about recreating it, with inheritance and changing. Not sure if it is worth it though.
Not a big deal, just suprised to see it gone from vb6.
*****************
"I know how hard it is for you to put food on your family." —GW
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you could have a global variable, that would tell whether or not it was already clicked, and if it is clicked a second time within a certain amount of time, call your double click function. You would have to delay any code for the single click event (assuming you want the capability to single click it, which I wouldn't understand why you wouldn't need that capability) untill the possibility of the second click has already occurred. if you understand what I mean. I'm a beginner, but this is the workaround I would take.
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Hi,
I have a project in which I access a mySQL Database and extract totals from it that are shown on a Form within a DataGridView. Can anyone tell me is it possible to access the values in the cells of this DataGridView from the Form, inorder to create an action dependant on a comparison of two of the cells values?
Thanks
Denis
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hi guys i want to strip ceartin information from between tags but they differ in some things:
1:
<b><a.*?>(strip this 1)</a></b>
2:
<b>(strip this 2)</b>
3:
<b><a.*?><b>(strip this 3)</b></a></b>
Using the same regex object(i.e one expression for all 3), it got to be....
please can any one help
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thanx but wud it be ok to do it with tags:
<a.*?>?|+
how wud the expression look like...
regards
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Does anyone know a nifty way to automaticly convert a VB.Net project into a C# project.
Sharp Develop has a function that converts from VB.Net -> C# or the other way, from C# -> VB.Net.
Although this function does a conversion it doesn't analyze the code.
For example:
Left(str,10) is allowed in VB but not in C#, however Sharp develop's converter doesn't detect this.
Regards
Hmitosh
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There is nothing that will do a perfect, and syntactically legal, conversion between the two. You'll always have to do some conversion by hand, even if the thing does analysis.
RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome
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We have a VB.NET to C# converter - Instant C# - that will typically do over 99% of the conversion work. (download the demo at www.instantcsharp.com)
The Microsoft.VisualBasic namespace functions that have direct and safe equivalences in the System namespace are converted, but the ones that don't are left as calls to the Microsoft.VisualBasic namespace.
David Anton
Tangible Software Solutions
www.tangiblesoftwaresolutions.com
Home of the Instant C# VB.NET to C# Converter and the Instant VB C# to VB.NET Converter
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The problem I have is that I want some icons to be changed...When I expand a Node I want for it another icon then the default when I click a Node that does not have subNodes I want another icon for it,
I have tried but it wont work when I expand the node the icon appears somewhere else...
Pls help...
And how can I make the right click of mouse to select a TreeNode like the left click..
PS:English is not my native language so pls excuse me!
(o)(o)
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1. Use GetTreeCtrl() to work with the CTreeCtrl object.
I assume you used already the CTreeCtrl::SetImageList() function.
Now use the CTrreCtrl::SetItem() function where you specify the wanted number values for the nImage and nSelectedImage parameters.
2. Derive a class form CTreeCtrl (let it be CMyTreeCtrl), change your object declaration from:
CTreeCtrl m_MyTree; into CMyTreeCtrl m_MyTree (or whatever you have there  ).
Now you can use the wizard to add a handler for the right click event (and a lot of other events).
Spe sa te ajute )
SkyWalker
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As prefera C# ca VB nu stiu mai deloc si nu prea inteleg dar am prins ideea!
(o)(o)
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Plus ca asta nu cred ca rezolva problema pt ca nodul pe care fac click dreapta nu o sa fie selectat si apoi la evenimentul after_select nu o sa apara ca nod selectat!
(o)(o)
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Hi!
I`m tryng to connect to a ftp-server which allows only a secure connection. Connecting with Flashfpx it works with both "auth ssl" and "auth tls", but when i try to do it with the menatils security-library and the example ftp-client i get this exception:
220 (glFTPd 2.00 Linux+TLS) ready.
AUTH TLS
234 AUTH TLS successful
Org.Mentalis.Security.SecurityException: An error occurs while communicating with the remote host. ---> Org.Mentalis.Security.Ssl.Shared.SslException: The server hello message uses a protocol that was not recognized.
at Org.Mentalis.Security.Ssl.Shared.CompatibilityLayer.ProcessServerHello(Byte[] bytes, Int32 offset, Int32 size) in D:\ssh-server\seclib-1.0\seclib\Security\Ssl\Shared\CompatibilityLayer.cs:line 80
at Org.Mentalis.Security.Ssl.Shared.CompatibilityLayer.ProcessHello(Byte[] bytes, Int32 offset, Int32 size) in D:\ssh-server\seclib-1.0\seclib\Security\Ssl\Shared\CompatibilityLayer.cs:line 71
at Org.Mentalis.Security.Ssl.Shared.SocketController.OnReceive(IAsyncResult ar) in D:\ssh-server\seclib-1.0\seclib\Security\Ssl\Shared\SocketController.cs:line 82
--- End of inner exception stack trace ---
at Org.Mentalis.Security.Ssl.SecureSocket.EndSend(IAsyncResult asyncResult) in d:\ssh-server\seclib-1.0\seclib\security\ssl\securesocket.cs:line 380
at Org.Mentalis.Security.Ssl.SecureSocket.Send(Byte[] buffer, Int32 offset, Int32 size, SocketFlags socketFlags) in d:\ssh-server\seclib-1.0\seclib\security\ssl\securesocket.cs:line 326
at FtpClient.SendCommand(String command) in d:\csharpproggies\windowsapplication1\ftpclient.cs:line 146
at FtpClient.DownloadFile(Url url, Int32 choice) in d:\csharpproggies\windowsapplication1\ftpclient.cs:line 115
at FtpClient.Start() in d:\csharpproggies\windowsapplication1\ftpclient.cs:line 91
at FtpClient.Main(String[] args) in d:\csharpproggies\windowsapplication1\ftpclient.cs:line 48
I´ve read somewhere that the menatlis-library didn´t support dhe/dss and the server seems to need this. Here´s a part of the log when connecting with FlashFXP:
[R] AUTH SSL
[R] 234 AUTH SSL successful
[R] Connected. Negotiating SSL session..
[R] SSL negotiation successful...
[R] SSL encrypted session using cipher DHE-DSS-AES256-SHA (256 bits)
[R] PBSZ 0
[R] 200 PBSZ 0 successful
I´ve been told OpenSSL would support this authenticationmode, but i don´t have a clue how to use this library in my project. Any suggestions and help will be appreciated.
Azrael
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Dear all,
I developed a tool window, which is a custom graphical editor. Now I would
like to use standard visual studio undo/redo buttons and printing dialog.
But these buttons are disabled when my toolwindow is focused, and also not
passed to Querystatus of the addin. On other hand, for example, build-in
form editor can usees the buttons.
May be somebody could help me?
Thanks in advance,
Boni
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This is probably a stupid basic question but...
When setting a new variable to the value of an existing reference variable how do you tell c# to copy the variable instead of copying the reference the variable holds.
SuzyB
If I had a better memory I would remember more.
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Not exactly what you're after, but one solution is to implement ICloneable and call the Clone method.
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