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Securing ADO.NET Connection Strings

, 25 Aug 2006
Some possible ways to encrypt and store connection strings in an ADO.NET application.
secureconnectionstring_demo.zip
Secure ADO.NET Connection String_demo
Secure ADO.NET Connection String.exe
secureconnectionstring_src.zip
Secure ADO.NET Connection String_src
My Project
Application.myapp
Settings.settings
<Global.Microsoft.VisualBasic.CompilerServices.DesignerGenerated()> _
Partial Class Form1
    Inherits System.Windows.Forms.Form

    'Form overrides dispose to clean up the component list.
    <System.Diagnostics.DebuggerNonUserCode()> _
    Protected Overrides Sub Dispose(ByVal disposing As Boolean)
        If disposing AndAlso components IsNot Nothing Then
            components.Dispose()
        End If
        MyBase.Dispose(disposing)
    End Sub

    'Required by the Windows Form Designer
    Private components As System.ComponentModel.IContainer

    'NOTE: The following procedure is required by the Windows Form Designer
    'It can be modified using the Windows Form Designer.  
    'Do not modify it using the code editor.
    <System.Diagnostics.DebuggerStepThrough()> _
    Private Sub InitializeComponent()
        Me.PropertyGrid = New System.Windows.Forms.PropertyGrid
        Me.GroupBox1 = New System.Windows.Forms.GroupBox
        Me.rbConfig = New System.Windows.Forms.RadioButton
        Me.rbXML = New System.Windows.Forms.RadioButton
        Me.rbRegistry = New System.Windows.Forms.RadioButton
        Me.btnReset = New System.Windows.Forms.Button
        Me.btnDecrypt = New System.Windows.Forms.Button
        Me.btnEncrypt = New System.Windows.Forms.Button
        Me.GroupBox1.SuspendLayout()
        Me.SuspendLayout()
        '
        'PropertyGrid
        '
        Me.PropertyGrid.Location = New System.Drawing.Point(2, 3)
        Me.PropertyGrid.Name = "PropertyGrid"
        Me.PropertyGrid.Size = New System.Drawing.Size(218, 261)
        Me.PropertyGrid.TabIndex = 0
        '
        'GroupBox1
        '
        Me.GroupBox1.Controls.Add(Me.rbRegistry)
        Me.GroupBox1.Controls.Add(Me.rbXML)
        Me.GroupBox1.Controls.Add(Me.rbConfig)
        Me.GroupBox1.Location = New System.Drawing.Point(226, 12)
        Me.GroupBox1.Name = "GroupBox1"
        Me.GroupBox1.Size = New System.Drawing.Size(196, 109)
        Me.GroupBox1.TabIndex = 1
        Me.GroupBox1.TabStop = False
        Me.GroupBox1.Text = "Store Connection String in:"
        '
        'rbConfig
        '
        Me.rbConfig.AutoSize = True
        Me.rbConfig.Checked = True
        Me.rbConfig.Location = New System.Drawing.Point(25, 19)
        Me.rbConfig.Name = "rbConfig"
        Me.rbConfig.Size = New System.Drawing.Size(106, 17)
        Me.rbConfig.TabIndex = 0
        Me.rbConfig.TabStop = True
        Me.rbConfig.Text = "Configoration File"
        Me.rbConfig.UseVisualStyleBackColor = True
        '
        'rbXML
        '
        Me.rbXML.AutoSize = True
        Me.rbXML.Location = New System.Drawing.Point(25, 51)
        Me.rbXML.Name = "rbXML"
        Me.rbXML.Size = New System.Drawing.Size(66, 17)
        Me.rbXML.TabIndex = 1
        Me.rbXML.Text = "XML File"
        Me.rbXML.UseVisualStyleBackColor = True
        '
        'rbRegistry
        '
        Me.rbRegistry.AutoSize = True
        Me.rbRegistry.Location = New System.Drawing.Point(25, 86)
        Me.rbRegistry.Name = "rbRegistry"
        Me.rbRegistry.Size = New System.Drawing.Size(63, 17)
        Me.rbRegistry.TabIndex = 2
        Me.rbRegistry.Text = "Registry"
        Me.rbRegistry.UseVisualStyleBackColor = True
        '
        'btnReset
        '
        Me.btnReset.Location = New System.Drawing.Point(263, 127)
        Me.btnReset.Name = "btnReset"
        Me.btnReset.Size = New System.Drawing.Size(116, 23)
        Me.btnReset.TabIndex = 5
        Me.btnReset.Text = "Reset PropertyGrid"
        Me.btnReset.UseVisualStyleBackColor = True
        '
        'btnDecrypt
        '
        Me.btnDecrypt.Location = New System.Drawing.Point(328, 233)
        Me.btnDecrypt.Name = "btnDecrypt"
        Me.btnDecrypt.Size = New System.Drawing.Size(96, 23)
        Me.btnDecrypt.TabIndex = 7
        Me.btnDecrypt.Text = "Decrypt-Retrieve"
        Me.btnDecrypt.UseVisualStyleBackColor = True
        '
        'btnEncrypt
        '
        Me.btnEncrypt.Location = New System.Drawing.Point(226, 233)
        Me.btnEncrypt.Name = "btnEncrypt"
        Me.btnEncrypt.Size = New System.Drawing.Size(96, 23)
        Me.btnEncrypt.TabIndex = 6
        Me.btnEncrypt.Text = "Encrypt-Store"
        Me.btnEncrypt.UseVisualStyleBackColor = True
        '
        'Form1
        '
        Me.AutoScaleDimensions = New System.Drawing.SizeF(6.0!, 13.0!)
        Me.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font
        Me.ClientSize = New System.Drawing.Size(429, 268)
        Me.Controls.Add(Me.btnDecrypt)
        Me.Controls.Add(Me.btnEncrypt)
        Me.Controls.Add(Me.btnReset)
        Me.Controls.Add(Me.GroupBox1)
        Me.Controls.Add(Me.PropertyGrid)
        Me.FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedDialog
        Me.MaximizeBox = False
        Me.MinimizeBox = False
        Me.Name = "Form1"
        Me.Text = "Secure ADO.NET Connection String"
        Me.GroupBox1.ResumeLayout(False)
        Me.GroupBox1.PerformLayout()
        Me.ResumeLayout(False)

    End Sub
    Friend WithEvents PropertyGrid As System.Windows.Forms.PropertyGrid
    Friend WithEvents GroupBox1 As System.Windows.Forms.GroupBox
    Friend WithEvents rbRegistry As System.Windows.Forms.RadioButton
    Friend WithEvents rbXML As System.Windows.Forms.RadioButton
    Friend WithEvents rbConfig As System.Windows.Forms.RadioButton
    Friend WithEvents btnReset As System.Windows.Forms.Button
    Friend WithEvents btnDecrypt As System.Windows.Forms.Button
    Friend WithEvents btnEncrypt As System.Windows.Forms.Button

End Class

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About the Author

Levan Midodashvili
Web Developer
Georgia Georgia
Lecturer in Gori University (Georgia)

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