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This walkthrough demonstrates how to encrypt and decrypt content. The code examples are designed for a Windows Forms application. This application does not demonstrate real world scenarios, such as using smart cards. Instead, it demonstrates the fundamentals of encryption and decryption.
Public-key cryptography, or asymmetric cryptography, is a cryptographic system that uses pairs of keys: public keys, which may be disseminated widely, and private keys,which are known only to the owner. The generation of such keys depends on cryptographic algorithms based on mathematical problems to produce one-way functions. Effective security. Nov 16, 2018 Enable the System cryptography: Use FIPS compliant algorithms for encryption, hashing, and signing setting. Potential impact Client devices that have this policy setting enabled cannot communicate by means of digitally encrypted or signed protocols with servers that do not support these algorithms. ' Declare CspParmeters and RsaCryptoServiceProvider ' objects with global scope of your Form class. Dim cspp As CspParameters = New System.Security.Cryptography.CspParameters Dim rsa As RSACryptoServiceProvider ' Path variables for source, encryption, and ' decryption folders. Must end with a backslash.
This walkthrough uses the following guidelines for encryption:
- Use the RijndaelManaged class, a symmetric algorithm, to encrypt and decrypt data by using its automatically generated Key and IV.
- Use the RSACryptoServiceProvider, an asymmetric algorithm, to encrypt and decrypt the key to the data encrypted by RijndaelManaged. Asymmetric algorithms are best used for smaller amounts of data, such as a key.NoteIf you want to protect data on your computer instead of exchanging encrypted content with other people, consider using the ProtectedData or ProtectedMemory classes.
The following table summarizes the cryptographic tasks in this topic.
Task | Description |
---|---|
Creating a Windows Forms application | Lists the controls that are required to run the application. |
Declaring global objects | Declares string path variables, the CspParameters, and the RSACryptoServiceProvider to have global context of the Form class. |
Creating an asymmetric key | Creates an asymmetric public and private key value pair and assigns it a key container name. |
Encrypting a file | Displays a dialog box to select a file for encryption and encrypts the file. |
Decrypting a file | Displays a dialog box to select an encrypted file for decryption and decrypts the file. |
Getting a private key | Gets the full key pair using the key container name. |
Exporting a public key | Saves the key to an XML file with only public parameters. |
Importing a public key | Loads the key from an XML file into the key container. |
Testing the application | Lists procedures for testing this application. |
Prerequisites
You need the following components to complete this walkthrough:
- References to the System.IO and System.Security.Cryptography namespaces.
Creating a Windows Forms Application
Most of the code examples in this walkthrough are designed to be event handlers for button controls. The following table lists the controls required for the sample application and their required names to match the code examples.
Control | Name | Text property (as needed) |
---|---|---|
Button | buttonEncryptFile | Encrypt File |
Button | buttonDecryptFile | Decrypt File |
Button | buttonCreateAsmKeys | Create Keys |
Button | buttonExportPublicKey | Export Public Key |
Button | buttonImportPublicKey | Import Public Key |
Button | buttonGetPrivateKey | Get Private Key |
Label | label1 | Key not set |
OpenFileDialog | openFileDialog1 | |
OpenFileDialog | openFileDialog2 |
Double-click the buttons in the Visual Studio designer to create their event handlers.
Declaring Global Objects
Shogun total war product key generator. Add the following code to the Form's constructor. Edit the string variables for your environment and preferences.
Creating an Asymmetric Key
This task creates an asymmetric key that encrypts and decrypts the RijndaelManaged key. This key was used to encrypt the content and it displays the key container name on the label control.
Add the following code as the
Click
event handler for the Create Keys
button (buttonCreateAsmKeys_Click
).Encrypting a File
This task involves two methods: the event handler method for the
Encrypt File
button (buttonEncryptFile_Click
) and the EncryptFile
method. The first method displays a dialog box for selecting a file and passes the file name to the second method, which performs the encryption.The encrypted content, key, and IV are all saved to one FileStream, which is referred to as the encryption package.
The
EncryptFile
method does the following:- Creates a RijndaelManaged symmetric algorithm to encrypt the content.
- Creates an RSACryptoServiceProvider object to encrypt the RijndaelManaged key.
- Uses a CryptoStream object to read and encrypt the FileStream of the source file, in blocks of bytes, into a destination FileStream object for the encrypted file.
- Determines the lengths of the encrypted key and IV, and creates byte arrays of their length values.
- Writes the Key, IV, and their length values to the encrypted package.
The encryption package uses the following format:
- Key length, bytes 0 - 3
- IV length, bytes 4 - 7
- Encrypted key
- IV
- Cipher text
You can use the lengths of the key and IV to determine the starting points and lengths of all parts of the encryption package, which can then be used to decrypt the file.
Add the following code as the
Click
event handler for the Encrypt File
button (buttonEncryptFile_Click
).Add the following
EncryptFile
method to the form.Decrypting a File
This task involves two methods, the event handler method for the
Decrypt File
button (buttonDecryptFile_Click
), and the DecryptFile
method. The first method displays a dialog box for selecting a file and passes its file name to the second method, which performs the decryption.The
Decrypt
method does the following:- Creates a RijndaelManaged symmetric algorithm to decrypt the content.
- Reads the first eight bytes of the FileStream of the encrypted package into byte arrays to obtain the lengths of the encrypted key and the IV.
- Extracts the key and IV from the encryption package into byte arrays.
- Creates an RSACryptoServiceProvider object to decrypt the RijndaelManaged key.
- Uses a CryptoStream object to read and decrypt the cipher text section of the FileStream encryption package, in blocks of bytes, into the FileStream object for the decrypted file. When this is finished, the decryption is completed.
Add the following code as the
Click
event handler for the Decrypt File
button. https://heavenlyyes702.weebly.com/windows-81-pro-product-key-generator-2016.html.Add the following
DecryptFile
method to the form.Exporting a Public Key
This task saves the key created by the
Create Keys
button to a file. It exports only the public parameters.This task simulates the scenario of Alice giving Bob her public key so that he can encrypt files for her. He and others who have that public key will not be able to decrypt them because they do not have the full key pair with private parameters.
Add the following code as the
Click
event handler for the Export Public Key
button (buttonExportPublicKey_Click
).Importing a Public Key
This task loads the key with only public parameters, as created by the
Export Public Key
button, and sets it as the key container name.Which Cryptography System Generates Encryption Keys In Excel
This task simulates the scenario of Bob loading Alice's key with only public parameters so he can encrypt files for her.
Add the following code as the
Click
event handler for the Import Public Key
button (buttonImportPublicKey_Click
).Getting a Private Key
This task sets the key container name to the name of the key created by using the
Create Keys
button. The key container will contain the full key pair with private parameters.This task simulates the scenario of Alice using her private key to decrypt files encrypted by Bob.
Add the following code as the
Click
event handler for the Get Private Key
button (buttonGetPrivateKey_Click
).Testing the Application
After you have built the application, perform the following testing scenarios.
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To create keys, encrypt, and decrypt
- Click the
Create Keys
button. The label displays the key name and shows that it is a full key pair. - Click the
Export Public Key
button. Note that exporting the public key parameters does not change the current key. - Click the
Encrypt File
button and select a file. - Click the
Decrypt File
button and select the file just encrypted. - Examine the file just decrypted.
- Close the application and restart it to test retrieving persisted key containers in the next scenario.
To encrypt using the public key
- Click the
Import Public Key
Cd keys discount code generator for sale. button. The label displays the key name and shows that it is public only. - Click the
Encrypt File
button and select a file. - Click the
Decrypt File
button and select the file just encrypted. This will fail because you must have the private key to decrypt.
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This scenario demonstrates having only the public key to encrypt a file for another person. Typically that person would give you only the public key and withhold the private key for decryption.
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To decrypt using the private key
- Click the
Get Private Key
button. The label displays the key name and shows whether it is the full key pair. - Click the
Decrypt File
button and select the file just encrypted. This will be successful because you have the full key pair to decrypt.