Save And Retrieve A Key / IV Pair Securely?
May 17, 2010
I'm using VB.Net's RijndaelManaged (RM) to encrypt files, using the RM.GenerateKey and RM.GenerateIV methods to generate the Key and IV and encrypting the file using the CryptoStream class. I'm planning on saving this Key and IV to a file and want to make sure I'm doing it the right way. I am combining the IV+Key, and encrypting that with my RSA Public key and writing it out to a file. Then, to decrypt I use the RSA Private key on this file to get the IV+Key, split them up and set RM.Key and RM.IV to these values and run the decryptor.
Is this the best method to accomplish this, or is there a preferred method for saving the IV & Key?
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Mar 29, 2010
I am creating a VB.NET application for a Calculus class as a little side-project. It requires user profiles that are saved locally in the program's main files. I am using 2 separate classes to access the user profiles right now.
The first class is called Config and it is used to manipulate the basic config file which contains lesson document paths, settings, and user profile names.
The second class is called User and it is used to load up user profiles from a profile directory where user data is saved in separate text files.
The Config class retrieves the user names, and user profile text file paths. This text file path is then handed off to a User object that can then load up and interpret the file.
how should I format the config file and user files so they are secure enough that someone can not easily retrieve or manipulate data?
Here is a sample of how I am reading the text files:
Dim userList() As String = {Nothing}
If My.Computer.FileSystem.FileExists(configPath + "config.cfg") Then
Using MyReader As New Microsoft.VisualBasic.FileIO.TextFieldParser(configPath + "config.cfg")
[Code]....
The problem isn't reading the text file, I am just not sure how to make it secure. I was thinking about first parsing the entire file to translate it from 'encrypted' to text, and then save it as a temporary file which I would pass off to the above code, then delete the file immediately afterward. As for 'encrypting' (is that the right word for this?) the file, I could maybe bit-shift each character using a key that I would save at the beginning of the file.
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Apr 27, 2011
I have an application that authenticates against a third party web service by sending a username and password. At the moment I'm typing the password on a winform each time I start the application - but I need it to login automatically.
I'd like to store the username/password somewhat more securely than
Dim username as String = "username"
Dim password as String = "password"
I understand that I probably won't stop a determined hacker with access to my source code, but storing them as plaintext feels wrong. I've found some similar questions on here but none that provide me with an answer I can use.
Edit: The web service isn't mine, it's an API that requires me to login to use.
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Jan 22, 2012
I have a vb.net application that uses my gmail smtp server settings and my password to send me the users feedback through the email, (I don't want to show my email to the users)
The problem is I want to store these data securely in the vb.net application so that It's hard for any hackers/crackers through (reverse engineering or programs like cheat engine) to get my gmail account data.
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May 15, 2012
I need to know what is the common way to store a SQL server connection string for an application in VB.NET.How do I read app.config values How to do it in ASP How do I store a connectionstring (unencrypted thus unsafe)It's quite frustrating not to find a decent and full answer on how to store a connection string in VB.NET in app.config (or settings.settings if it's better) safely. At the moment it's hardcoded and so it is immobile and in plain text.
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Sep 25, 2009
I've a program that is used for marking exam paper. The exam paper is actually an image being scanned.
The marker will have to retrieve an unmark 'exam paper' from the SQL server column named 'Answersheet'.
After marking, the marker will then save the marked 'exam paper' into the SQL server column named 'MarkedAnswersheet'.
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Jun 19, 2010
I have a question for store data from vb.net
I want to store data a file without use any database engin and
Retrieve and save data from DataTable
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May 17, 2012
I tried the following code to retrieve data from an excel file,apply query and save the result of query to another excel file. Now there are two problems: One,I am getting the required data but some reduntant unwanted data too. Second,It only works if the excel file, from which the data is retrieved, is open.
Dim dr As OleDbDataReader
Dim i As Integer
Dim strLine As String = ""
[Code].....
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Apr 2, 2009
[Code]...
how can I add a new row and save those records in the TextBoxes?
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Dec 13, 2011
I had following form.How to store and retrieve the user setting? So the next time the app will run the information as had saved? I had found related example,but not very understand about it.[URL]The setting i want to save is background image from resource, forecolor, checkbox and trackbar.
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Dec 4, 2009
im trying to make a basic Database
Its suppose to save the stuff written in the texbox for example
I have to input 255 students Name, address, age and Birthdays and save them all and then try to find all of the info stored by entering the Name.
Also i have to generate a student Id not just giving a Id to them so for example if the first student i enter his ID # should be 1 and so on as i enter the name
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Jan 10, 2011
I'm doing a program that could save and retrieve image from database. My problem is I would not able to save images with my codes..
[Code]...
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Jan 29, 2010
im making a litle program to save images in database and to retrieve them from there and display in a radgrid.i have made some code for saving images
Dim intLength As Integer
Dim arrContent As Byte()
If fileupload.PostedFile Is Nothing Then
[code]....
it works fine but the problem is that i cant find the way to retrieve them from database ,i mean i cant convert binary files in images format.
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Mar 11, 2010
how to save/retrieve image into database in vb.net
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Jun 12, 2011
I' successfully created a project fully functional using access database. I've read about SQL connection on VB .net. how to save three text boxes into three fields in excel and a way to retrieve it if I want.
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Mar 11, 2010
i am a new user of visual studio 2008i make a database program, but i cant save the image in access data base, i also want that image save a copy file in database.
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Jan 29, 2009
How to save and retrieve images in a vb.net 2005 program
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Mar 11, 2010
How to Save and retrieve picture in access data base with vb.net 2008
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May 25, 2010
how to save data to a database that is in access and retrieve them anytime.
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Apr 14, 2009
I am doing a project on creating a database using vb.net. I need to be able to add records, save, delete and retrieve these data. I am a beginner so far I have created the design I need to be able to link many forms such as order form, find customers, add customers etc. How do i go about this.
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Jun 10, 2011
i want to retrieve data from text file and save it to sql database bt i just have to implement some conditions like if there are 3 entries exists in text file with the same ID but i just have to get only 2 of them so in what manner should i write the code....
Dim sbIDs As New System.Text.StringBuilder
Dim sbPunchDateStamp As New System.Text.StringBuilder
Dim sbPunchTimeStamp As New System.Text.StringBuilder
[Code].....
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Jan 27, 2010
I am looking for ways to retrieve data from textfile and save it into access database. Currently, I am doing a attendance record project. I need to save the attendance record which is given in a text file to the database. The version of VB i using is VB 2008.
The content of the text file look like this:
E010,2009/06,06/29/2009 7:44:45AM,06/29/2009 15:00:55PM,JUR
E022,2009/06,06/29/2009 7:44:45AM,06/29/2009 15:00:55PM,JUR
[Code]....
I tried to create a class and store the record but it just don't work.
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Aug 29, 2010
I have a mySQL table(IMP_SCANS) holding the file, it's name and size for every document:
scan_1 blob
description varchar
filesize int
doc_no varchar
doc_date date
I managed to insert a file to the table. Now I need to save the file to disk.
So I have the code:
Dim conn As New MySqlConnection
Dim cmd As New MySqlCommand
Dim myData As MySqlDataReader
Dim SQL As String
Dim FileSize As UInt32
Dim fs As FileStream
[CODE]............
I all works fine up to the line: myData.GetBytes(myData.GetOrdinal("scan_1"), 0, rawData, 0, filesize) Where it says "Object reference not set to an instance of an object". I cannot figure out why I receive this error.
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Apr 3, 2009
I am looking for code examples that allow me to write a user's view settings (field sorted by, label selections, etc.) from the detail view of a file open (GetOpenFileName) API
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Apr 30, 2010
I would like to save Gridview with all of the columns value and reload the same grid without using database?
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Apr 15, 2010
<VB.Net 2008 + SQL 2005 Server> I am trying to implement an HR application to save an employee picture into local folder of , not into Database, and retrieve by VB.Net application. Only the file location of the picture image will be stored in database instead of the picture.
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Mar 25, 2011
How can I save a date data type from vb.net to access that access have date/time in its data type and how can I retrieve it? I also want to use datediff to auto calculate the age to be shown in a textbox.
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Jan 6, 2010
I want to retrieve the selected items in a listbox, save them to a collection, and then use that collection later. I thought that was simple enough, but when I clear the selected items in the listbox, my collections (items, indices) change. I found this out by stepping through the code.
Basically what I'm wanting to do is move items in the listbox up or down (up in this case), and still keep them selected.
[Code]...
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Jun 18, 2009
The following code checks each sentence in the listbox and if certain conditions are matched it add a piece of data to the list new question. Each input from the user is checked against each sentance in the listbox and if a match is found (based on the conditions) only then the data is added to the list and the loop exits. My problem now is that for each itteration cycle In_dep_token_pair.Key and trigger_dependency_token_pair can not be Subject and DirectObject at the same time. Is there any way to test for the next item in the keyvaluepair within the same itteration cycle? Something like trigger_dependency_token_pair(current item).Key = "Subject" and trigger_dependency_token_pair.key = "DirectObject".
If (Input_pair.Key = predicate) And (In_dep_token_pair.Key = "Subject" And trigger_dependency_token_pair.Key = "Subject") And _
(In_dep_token_pair.Value = trigger_dependency_token_pair.Value) Then
If (In_dep_token_pair.Key = "DirectObject" And trigger_dependency_token_pair.Key = "DirectObject") Then
If (In_dep_token_pair.Value = trigger_dependency_token_pair.Value) Then
[code].....
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Mar 21, 2012
I am having trouble in browse & then save an image to SQL Server.ALso I want to retrieve that image.This is the code to browse image & show it in PictureBox1 Control
Public Sub SelectImage()
With OpenFileDialog1
'.InitialDirectory = "C:"
[code]....
But don't know how to pass it to image parameter .Also is there any way that I can save image on Local drive & just save the url /location/name in database?
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