.net - Using Rjindael And RSA To Encrypt Data Stored In QR Code In Visual?
Jun 23, 2011
I'm wanting to encrypt some data (hopefully under five hundred bytes' worth) and store it in a QR code. Originally I wanted to use RSA, so the data would be signed with User A's private key and User B's public key, but unfortunately, VB.NET doesn't like encrypting that much data. I've read that I should use Rjindael to encrypt the actual data, and then use RSA to encrypt the key used by Rjindael. However, I'm not having much luck being able to search the web for some kind of tutorial or something.
Also, if I was wanting to store this on a QR code, wouldn't I have to store both the encrypted data and the encrypted key used by Rjindael? Do you think this would all fit? I may be able to use version 40 on medium error correction [URl].. it stores 18,672 "data bits"), but I would prefer to use a lower version (that is, smaller) if at all possible.Generating the QR code won't be the problem (I know there's a .NET library for that), I'm just curious about getting the data encrypted to begin with.
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Jul 23, 2009
encrypt the string values stored in the code.The problem is that when the code is compiled and the .exe file is generated, anybody can edit the .exe file with an text editor or another program and see the values.This is very important for me, because i have some password stored in string variables?
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Jun 13, 2011
Need to design a program that can encrypt and decrypt messages stored in simple text files using a private key stored in a separate file. Software should also be able to allow the users to enter simple messages that either displays the encrypted or decrypted message. The encryption method should use a simple substitution method. It should be set out in the following format:
Example (the "@" is the separator):
@
The character The Code End of line
A @ 4gh EOL
B @ 84!9 EOL
Has to use the 256 ASCII character codes. The separator will be used to separate the character and its corresponding code.Here are the pseudocodes I have come up with:
� Read any private key file
separator = readline(file);
while not EOF(file) do
tempStr = readline(file);
[code].....
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Jan 21, 2010
Is there any built in Encryption function in Visual basic 2008 that I can use? I want to encrypt my file because it is written in XML format any as far as everyone know... XML can read by anyone that has notepad or any related software.To aim is not enough.
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Apr 29, 2011
Tools for my website.Visual Studio 2010SQL Management Studioasp.netvisual basic.netI am using GridView. Because of my search code I am not able to use the automatic delete function that GridView has to offer.I clicked on GridView, said "Add New Column" and added a checkbox column.I want to be able to check one or more boxes and select a button that will delete those rows from the database using a stored procedure.
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Nov 12, 2009
i have found a few encrypt/decrypt tutorials online but either they dont work or they only work when the application is running so if i encrypt a string using some code i find and save it (in its encrypted form) and then restart the application and enter the saved encrypted string into a textbox and run the decrypt code it wont decrypt it. i don't understand why en/de-cryption is so hard or why there are so little working examples online. could someone be so kind and show me some code that can let me en/de-crypt a string even if i restart the application or use it on a different computer? and doesn't show the weak key errors all the time.
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Jan 12, 2012
I tried with the following code. It encrypted the file but after I FTP'd the file to my vendor he was not able to decrypt it.Then realized that this code is not using my PGP Keys to encrypt the file. It's creating a new key automatically. That's the reason my vendor is not able to decrypt the file. How can I encrypt the file using my PGP keys? So that my vendor can decrypt the file using same PGP keys.
' Encrypt textfile with Rijndael encryption
Public
Shared
Sub Encrypt(ByVal[code].....
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Apr 4, 2011
I'm trying to make a updater for my program at first i tried putting a password on the files folder then users can download the new zip file when its updated but when they first time install it wont have the password on it so i then decided not to use a password and am wondering how would i encrypt a line of code in the program? its the line that contains the database info so obviously i don't want my users to see that.
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Jun 16, 2009
I have forgotten the right procedure to encrypt the VB2008 code with dotfuscator community edition, may you explain the way to use it (the dotfuscator) step by step?
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Apr 23, 2009
I made a program that encrypts data and puts it on a txt file. There are two parts of information that need to be "linked" to the other. Say its Person 1, then Person 1 gender, they need to be placed together. Each encrypted piece of seperated by a ";". I have it read the file and place the information on a Rich Text Box. How can I read all the encrypted info and stop at ";" then place that into a variable then read the next bit? I did this a while back but I used StreamReader/StreamWrite and can't remember how I did it. Right now it reads through the open file dialog and writes it to the Text Box with this command writetext.LoadFile(sFilePath, RichTextBoxStreamType.PlainText)
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Apr 24, 2009
I have the following line in my web.config
<appSettings>
<add key="AdminPassword" value="ASDF1234" />
</appSettings>
How can I encrypt it?
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Jul 13, 2011
how I can Encrypt the data that is requested/sent? I wrote an application that connects to MySQL to INSERT/UPDATE/READ information from/to. The application also connects to a website of mine. I have obfuscated the codes so that people can not simply de-compile it to see my information. However I, or anyone, can simple use Wireshark or Fiddler to see information like...
How can I encrypt that so i can at least feel a bit safer... the attacker can also use replay attack on my website until they get into a user's account...
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Aug 23, 2011
What are the best way to encrypt and decrypt stream of data ?I would like that my program read a file.. and unencrypt it in memory then when it save it.. it encrpyt the stream and save it.
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Mar 29, 2010
My database is going to contain personal data. (such as contact details, names, password, etc...) This is what I need:
1) I need to encrypt the database
2) However, i will also need to be able to use it in my vb.net program.
To expand on my second point, i will need to be able to display the data (non-encrypted, obviously), and i will need to be able to compare user inputted data to the database data (like, i will be using datasets, so, IF txtUsername.text = ds.tables(0) ...)
[Code]...
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May 22, 2011
I have a Problem Creating a stored Procedure I keep getting an Error Message saying
Incorrect syntax near '@BFDateTimePicker',Must declare the scalar variable "@BfDateTimePicker",
Must declare the scalar variable "@Date_Time_Taken". what is wrong with my code. I have looked at video and other code to no avail
[Code]...
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Sep 2, 2010
I'm just starting to really get into JSON as a tool for my sites. I was showing my friend how I am calling a WS and returning the data, and he asked me about security of passing JSON data to and from a web service as he saw the data from the "POST" (via Firebug). Many of our public facing sites deal with member information and contain PHI.
Can I encrypt the JSON data and then unencrypt it? Is that a good way to go about it to ensure a layer of protection? Or is there another "better/right" way of doing it? Or are his concerns unfounded? how to encrypt or secure the JSON data when needed? Just trying to gather as much knowledge as possible before I go down a path that won't work for the company.
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Oct 11, 2009
I need to encrypt some basic data being sent from server to client.
I was going to open a file in bytes, convert it to chrs (Modify odd numbers by adding 2 and even numbers by adding 3) then use Base 32 (Triacontakaidecimal) or Base 16 (although base 16 will occupy twice the space). Convert the data back to bytes and after do the same with the decryptor.
About using base 32, is there some sort of class in vb.net or maybe an api?
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Dec 10, 2011
So I have an application that saves and retrieves images from an Access database. The images are displayed in a picturebox but I'm having a bad time figuring out how can I move to the next/previous record/image in the database, so the user can view them and delete it if he wants to...
Here is a screen of my form so you can better understand what I'm trying to do:
And here is the
Imports System.Data.OleDb
Public Class Form1
Dim dbConnection As New OleDbConnection
[Code]....
Save and delete functions work fine, I just need to know how to do the Next and Previous buttons... This should be easy to do, but I'm still a beginner to VB
Biggest problem is that this is a part of a school work which I must deliver tomorrow.
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Nov 16, 2011
I have created Stored Procedure in server explorer, and added this to my Form1
however, I find out I cannot simply use QueriesTable.Adapter.StoredProcedure1 in my VB code but I can add this Stored Procedure from TableAdapter and use TblContactTableAdapter.StoredProcedure1 to use this procedure, but I think it's kinda fool, why can't I use it directly from QueriesTableAdapter?
And I would like to know:
I think it's good to make stored procedure in database design so this procedure is saved in database server, rather than Client Side Application
Also, are queries created from TableAdapter saved in Client Side Application? which is not saved in database server side?
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Feb 28, 2010
Here's an interesting problem, and I'm looking for a pattern that will keep it all workable. I am building a smart-client app for a school system. It will contain information about students including their report cards, sick days, and so forth. it will generate student-level reports, including their report cards, each rich with very personal commentary by their teachers. The app will retrieve data from the remote server via web services.
[Code]...
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Mar 16, 2009
I have a Web Service Application Project in Visual Studio 2008. This is supposed to be an ASP.Net 2.0 project and at some point this has been rebuilt using 3.5.VS has kindly added in project level imports to System.Linq and System.Xml.Linq, but when I have re-targeted the project at 2.0 these project level imports have remained.Because the Web Service Application Project does not have the detailed window for editing project references I cannot find how to remove these project level imports.There is no .proj file which is where I would assume these were included.I cannot now build the project as it fails, even though I only get warnings (no errors reported) such as this:Namespace or type specified in the project-level Imports 'System.Linq' doesn't contain any public member or cannot be found. Make sure the namespace or the type is defined and contains at least one public member. Make sure the imported element name doesn't use any aliases.
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Oct 10, 2010
I have two windows vb.net form. I got a text file. I am trying to encrypt some data and save it to a text file with the 1st windows vb.net 2005 form. Now with the second one am trying to decrypt the data and retrieve it here.
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Dec 18, 2010
I create my algorthm and its finished but there is a problem, it encrypte all text and all text in a file but after decryption when i open my file (a video file)the player show all information about file(duration,size and ect) currectly but it dont play that my program encrypt and decrypt byte by byte and place a asci code in bytes(0 to 255)
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Feb 28, 2011
I'm having trouble writing the code to encrypt a file->networkstream->Decrypt the file.. I've tried several ways, but I keep failing....
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Jan 9, 2012
I realize this post is rather long, but I wanted to give all the information up front instead of people having to ask me for more information.At the end of the re-installation of Visual Studio 2008, there is this message:
"Microsoft SQL Publishing Wizard: [2] Error: Installation failed for component Microsoft SQL Publishing Wizard. MSI returned error code 1638" in the log file dd_error_vs_procore_90.txt.
I have searched on Google for this whole message and found some references to this error, but I have done what they said worked for them and it did not fix the problem for me.When I searched for just "MSI returned error code 1638", I got that it cannot install something because it is already installed:"Another version of this product is already installed. Installation of this version cannot continue. To configure or remove the existing version of this product, use Add/Remove Programs on the Control Panel".In Add/Remove Programs I see these two programs:
Microsoft SQL Server Database Publishing Wizard 1.3
Microsoft SQL Server Database Publishing Wizard 1.4
Are these programs/versions what the error is refering to? Am I safe to remove them and depend on the similarly-named item which would be newly installed with Visual Studio 2008 - "Microsoft SQL Publishing Wizard"? I still use SQL Server 2000 and 2005 on my computer, as well as 2008. I had installed VS 2008 on my computer before without this problem and also have VS 2005 and 2010.
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Dec 8, 2009
My app calls for the use of an SP that doesn't return rows from a table, but results based on certain conditions.
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Jan 25, 2010
when the user clicks on the add button another form launches, which enables the user to add student info such as name, address, course, start date and end date, this information is then written to class when the ok button on that form is clicked, and then displays the data on the initial form in data grid. the user can add multiple entries and they are all displayed on the intial form and a the data grid is populatedwhen any of the rows in the displayed grid is selected, and the update button is clicked then the same form launches as the previous one and but this time its in the update mode and pre populates the form with the inital values.
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Jul 6, 2011
How do I add a comment to code snippet in Visual Studio?
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Apr 13, 2011
I am using LLBLGEN Pro to generate a data layer...some of my stored procs have parameter name as "date"...so this is cauing a problem when I compile in VS2010...I have to go through the class and change the function parameters "date" to "[date]".
Is there a way to inject these changes in LLBLGEN Pro during code generation?
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Feb 3, 2010
Can convert this c# code to vb.net code.
DataClassesDataContext dc =
new DataClassesDataContext();
//proc_GetExistProductDetails is a Stored procedure method from my DataContext class.
[CODE]...
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