How To Decrypt Data From SQL Server
Dec 15, 2011
Im having a problem in my coding. I am doing a username and password application (sumtthing like a password keeper).
So I have created the interface and i integrated vb 2008 with sql server 2008. So the adding of account and password all went fine.
I have applied aes 128 bits for the password. that means when the user enters a new record for example an email and he click save, the password will automatically be encrypted before it is saved in the database.
now im having a problem where when i want to display the password in the gridview of vb.net (i decided to use grid view to show all the username and password), i am having trouble in decrypting the password column to show the real password to the user.
of course user cant decrypt the password using their brains. so I want to know how to choose dat particular column (password column) and decrypt it before it appears in the gridview.
bcoz now it is appearing gibberish i.e. aes 128 bits. Below i show u some snippet of my codes in encrypting and storing it in the database. [code....]
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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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May 10, 2012
THIS IS THE SAMPLE OF ENCRYPTED DATA PLEASE HELP ME HOW TO DECRYPT THIS KIND OF ENCRYPTION
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Oct 23, 2011
I'm using this function to encrypt data but how do I decrypt it?
Public Function GenerateHash(ByVal SourceText As String) As String
[code...]
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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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Dec 29, 2009
I am trying to build an Encryption/Decryption class/extension. I am able to encrypt the data no problem, but when I try to decrypt the data I am getting "Length of the data to decrypt is invalid."
Here is the entire class file.
Imports System.IO
Imports System.Text
Imports System.Text.Encoding
Imports System.Security.Cryptography
Imports System.Runtime.CompilerServices
Imports System.ComponentModel
[Code] .....
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Jan 4, 2012
System.Security.Cryptography.CryptographicException: Length of the data to decrypt is invalid.
My Code:
' Decrypt textfile with Rijndael encryption
Public
[code].....
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Aug 6, 2009
I'm trying to decrypt some data but I get this error: Padding is invalid and cannot be removed. It highlights the _streamWriter.Close() line. This is the code I'm using to decrypt a file:
[Code]...
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Feb 28, 2010
i have a app in visual basic mobile 2008, so i finish but now i need to tranfer the data generate in the in the app mobile to data base in sql server 2008.
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Jul 6, 2010
I want to know how you can export data from a disconnected database that could be access or ms sql to an sql server database.
Here is the scenario:
I have several software in a remote sites on either sql or ms access databases as back-ends...and I have another sql server database that i want to consolidate data from the remote sites.
One solution I have been thinking about is to use email to send incremental backups of the databases to the main database using a separate piece of software and have another one on the main server to pull that data into the database.
Basically am looking at setting up the remote databases as linked servers at the main database and then having incremental backups sent by email to the main database.
I have thought of replication but the internet link at the sites is terrible.
Is that a good implementation? If yes
How do i get to send the incremental backups and get them imported?(the code)
Tools:
Visual basic 2008 standard edition..Net 3.5
SQL Server 2005.
32 bit architecture.
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Aug 13, 2010
I am trying to do something fairly simple.. allow my user to import thier data from Excel into SQL Server, where it can be used by the application.To do this, I'm using the fairly simple code that is common everywhere I look:
strFilePath = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + fdlgFileOpen.FileName + ";Extended Properties=Excel 8.0"
connExcel = New OleDbConnection(strFilePath)
connExcel.Open()
[Code]...
Now, on my development computer this code works perfectly. The data imports, and I can go on my merry way.
On the TEST computer, this code throws the error: "ODBC -- Connection to {SQL Server} servernamesqlservername failed." This seems very odd to me, because I'm using exactly the same SQL Server and database to interact with the application, and all the other screens in the application work perfectly. The test computer CAN connect to this SQL Server, but it keeps throwing this error whenever I try import data from Excel.I've tried everything I can think of - using the server's IP address instead of the server name, sending the SQL Server administrator data along with the request, taking out the Trusted_Connection=Yes... nothing works. What is going on here? How can this code work fine on my computer, and hiccup on another?
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Sep 11, 2009
I am new to VB.net. I want to read and input file and store that data to an SQL Server database. Do you have an sample code that do such?
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Jun 27, 2011
Hey guys, I am trying to send data from client to server (encrypted) and the string sent from the client is not the same as recieved from the server. I've been killing my brain for hours to get this to work but I cant manage. Im converting everything to Base64 string.
Client:
Public Sub SendMessage(ByVal msg As String)
Try
SyncLock myclient.GetStream
sw = New IO.StreamWriter(myclient.GetStream)
[code]....
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Apr 19, 2011
I have a small program which is a tcp client. I send a string from this client to a device over ethernet (it acts as the tcp server). As soon as the device recieves the input string it will respond back with response data. My problem is i am not getting the entire response data back from the server. (device).
Dim serverStream As NetworkStream = clientSocket2.GetStream()
Dim outStream As Byte() = System.Text.Encoding.ASCII.GetBytes("my-cmd")
serverStream.Write(outStream, 0, outStream.Length)
[code]....
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Dec 15, 2011
I am using VB.Net 2010 and SQL Server 2005 Enterprise Edition I have created a table named customer having columns (id int, fullname varchar(50)) and id is my primary key I have created a Class Library for inserting data into the customer table. to insert data I am using following code...
Public Function insertData(ByVal TableName As String, ByVal LinkToDb As SqlConnection, ByRef Adapter As SqlDataAdapter, ByRef DS As DataSet, ByVal MyArray As ArrayList) As Integer
' ----- inserts data into table
Dim sqlCmd As SqlCommand
[Code]...
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Apr 1, 2009
I have a classic ASP page which constructed a querystring for a link to an ASP.NET page. Certain elements in the querystring are somewhat sensitive so I want to encrypt them. I've come across some techniques for doing this in ASP.NET and also in classic ASP but I'm not sure how to do it from classic ASP to ASP.NET. I'm using .NET 3.5.
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Jul 6, 2011
i got encrypt way so how can i decrypt it and the encrypt way is :
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Jan 2, 2010
i need a standard way of encrypting a string and decrypting it using AES. I am aware of the Cryptography class, however almost every example creates a class to do the encryption,If .Net already has this implemented and ready to use why would we create classes for encryption and decryption, isn't it as simple as calling the encrypt method of the class or decrpyt and passing in the text. Unless everyone is wanting to centralize the code. But even then i see so many different examples from File,Data Protection etc..
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Jun 13, 2010
There is a problem with the source code. I cannot convert the string to decrypt from encrypt string.[code]I went on breakpoint on that line and I have looked on quickwatch. The error I have caught is that convert is a type and cannot be used as an expression.
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Dec 26, 2011
I'm joining several files and would like to encrypt them with AES. As a test I'm joining the exact same file twice, but I'm never able to properly decrypt the second file.
Steps to reproduce:
Make sure you have a file "C:Original.pdf" or change the filepath.
1) Click Button1 to encrypt the file. This will create an encrypted file named "Encrypted.bin"
2) Click Button2 to decrypt the file. This will create a decrypted file named "Decrypted.pdf"
Both "Original.pdf" and "Decrypted.pdf" are 100% the same.
3) Uncomment the code between the hash character lines.
4) Repeat the first two steps.
"Original.pdf" and "Decrypted.pdf" are now not the same.
vb.net
Private enc As New Encrypt
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
'Encrypt
enc.EncryptDecrypt("C:Original.pdf", "C:Encrypted.bin", True)
[Code] .....
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Nov 10, 2011
i am trying to decrypt a file that was encrypted with Des. However not all of the file is encrypted just a few lines are. Here is an example of the file im trying to decrypt:
Random text
Encrypted Text
MD5 Hash
Encryption Key(Only there for tests)
Number of encrypted lines
The idea is to read the last three lines into variables and use them to decrypt the text. At the moment i use the number of lines - (the number of encrypted lines + 3) to find where the encrypted text starts. Then i was trying to copy the encrypted text to a temp file so i could run the code bellow on it, however i am getting an encoding error apparently i need to be using base64 or something. So my question is can anybody explain to me or show me how i can pull the encrypted text out of the file so that i can use the code bellow on it.
Dim DES As New DESCryptoServiceProvider()
'A 64-bit key and an IV are required for this provider.
'Set the secret key for the DES algorithm.
[Code].....
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Jan 29, 2009
I would like to decrypt a files that sis coming to me as pgp, is there anyway of doing this. without the pgp command or any other third party dll. or I rememeber A long time ago there was a .dll called NSDpgp3.dll but it only works with vb6 ( sdpgp3 was free)
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Jun 22, 2011
I need some help on saving/reading xml from/to dataset. I would like to make that complete file is encrypted and not only some elements inside or part of file.Currently this is not working in any way at all.[code]
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Dec 23, 2011
I ended up getting this properly working, as far as encrypting a file goes:How to encrypt and decrypt a file by using Visual Basic .NET or Visual Basic 2005 However, the catch is I have to change the name of the output file. What I was hoping to do is overwrite the original with the encrypted file, but when I tried that on a large file, it ended up only getting about 8 bytes of it.
Does anybody have any suggestions or recommendations? The overall idea is that I want to keep a file encrypted until it needs to be unencrypted for use by a program, but I'm not sure if there are better tools out there or if there's a better way of accomplishing this.
Question 2: I would really, really like to encrypt an entire folder, which I'm guessing would be faster than file by file, but when I try I keep getting access denied errors, even with DOS Cipher. Is there a way to do this with a key?
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Jul 18, 2010
there is anyone know how to encrypt and decrypt app config in vb.net??i want encrypt connection string and appsettings .
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Aug 15, 2011
How to encrypt and decrypt database..
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Aug 21, 2011
How to encrypt and decrypt database
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Jan 10, 2009
I am using vb.net 2008 i want to Know how can i encrypt text in a text box save it to a file then read the file decrypt the text and finaly display it in text box .
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Jul 28, 2011
I am trying to encrypt a zip in VB.NET to send to an android device using Air. Then once its on the device, decrypt it using the key and IV.
Here is part of my VB.NET Code:
Private Sub EncryptBytes(ByVal fileIn As String, ByVal fileOut As String, ByVal pass As String, ByVal ivString As String)
Dim crypt As New RijndaelManaged
crypt.KeySize = 256
[Code]...
This is not working ... Note that I tried to write a PKCS7 class based on a Java class I found. The hurlant package I downloaded only had PKCS5. VB.NET did not provide any of the same padding classes as hurlant comes with. I wish I could using "None" but I couldn't get passed the error in VB.I think there may also be an issue with the way I am converting a string into a byte array in VB vs Air.
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Mar 17, 2010
I give a file as parameter it crypts it with anything I don't really care if its safe or not I just want to person to not understand anything if he try's to read the file directly.so something like
[code]...
I want it to open the file, rechange it to the uncrypted value then close the file. I'm using serialization so it has to be able to crypt and decrypt anything serialization does.
Reason:
When I open the file the file serialized I can still see some text.I can still see some text. =]
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