User and Data Security in Visual C#.NET

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However, if you change the KeyContainerName value and rerun the application, the application will display a new private key because the .NET Framework will not find an existing key container.
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How to Encrypt and Decrypt Messages Using Asymmetric Encryption
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To encrypt and decrypt messages using asymmetric encryption, call the RSACryptoServiceProvider.Encrypt and RSACryptoServiceProvider.Decrypt methods. Both take two parameters:
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An array of bytes containing the message to be encrypted or
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decrypted.
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A Boolean value. When set to true, encryption and encryption will use OAEP data padding, which is supported only on Windows XP and later operating systems. When set to false, PKCS#1 v1.5 data padding will be used. Both the encryption and decryption methods must use the same data padding.
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The most challenging aspect of encryption is converting data into the byte array format. To convert strings to byte arrays, use the System.Text.Encoding.Unicode.GetBytes and System.Text.Encoding.Unicode.GetString methods. For example, the following console application encrypts a string using PKCS#1 v1.5 data padding, and then immediately decrypts and displays the string:
' VB Dim messageString As String = "Hello, World!" Dim myRsa As RSACryptoServiceProvider = New RSACryptoServiceProvider Dim messageBytes As Byte() = Encoding.Unicode.GetBytes(messageString) Dim encryptedMessage As Byte() = myRsa.Encrypt(messageBytes, False) Dim decryptedBytes As Byte() = myRsa.Decrypt(encryptedMessage, False) Console.WriteLine(Encoding.Unicode.GetString(decryptedBytes)) // C# string messageString = "Hello, World!"; RSACryptoServiceProvider myRsa = new RSACryptoServiceProvider(); byte[] messageBytes = Encoding.Unicode.GetBytes(messageString); byte[] encryptedMessage = myRsa.Encrypt(messageBytes, false); byte[] decryptedBytes = myRsa.Decrypt(encryptedMessage, false); Console.WriteLine(Encoding.Unicode.GetString(decryptedBytes));
Whichever encoding method you use to convert the data into a byte array, be sure you use a matching decoding method after decrypting the data.
Lesson 3: Encrypting and Decrypting Data
Validating Data Integrity with Hashes
Another important use of cryptography is protecting data integrity by using hashes. A hash is a checksum that is unique to a specific file or piece of data. You can use a hash value to verify that a file has not been modified after the hash was generated. Unlike encryption, you cannot derive the original data from the hash, even if the original data is very small. In other words, creating a hash is a one-way operation. Hashes are often used to enable passwords to be verified without storing the password itself. After the hash of the password has been stored, the application can verify the password by calculating the hash of the provided password and comparing it with the stored hash. The two hash values will match if the user has provided the same password; however, an attacker cannot determine the original password, even if the attacker gains access to the password s hash value.
Hash Algorithms in the .NET Framework
The .NET Framework includes six nonkeyed hash algorithms and two keyed hash algorithms. Table 12-4 lists each of the nonkeyed hash algorithms included with the .NET Framework. Each is member of the System.Security.Cryptography class, and is derived from System.Security.Cryptography.HashAlgorithm.
Table 12-4 Nonkeyed Hashing Algorithms
Abstract Class MD5 RIPEMD160
Implementation Class MD5CryptoServiceProvider RIPEMD160Managed
Description The Message Digest algorithm. The hash size for the MD5 algorithm is 128 bits. The MD160 hash algorithm. The has size for the MD160 hash algorithm is 160 bits. The Secure Hash Algorithm 1. The hash size for the SHA1 algorithm is 160 bits. The Secure Hash Algorithm 256. The hash is 256 bits. The Secure Hash Algorithm 384. The hash is 384 bits. The Secure Hash Algorithm 512. The hash is 512 bits.
SHA1 SHA256 SHA384 SHA512
SHA1CryptoServiceProvider SHA256Managed SHA384Managed SHA512Managed
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NOTE .NET 2.0
RIPEMD160 is new in .NET 2.0 and is intended as a replacement for MD5.
You have to take care to prevent attackers from modifying a hash value. If an attacker can modify a hash, he or she can effectively defeat the purpose of the hash. Keyed hash algorithms are algorithms that protect against modification of the hash by encrypting it by using a secret key that both the sender and receiver must have. Table 12-5 lists both of the keyed hash algorithms included with the .NET Framework, both derived from System.Security.Cryptography.KeyedHashAlgorithm.
Table 12-5
Keyed Hashing Algorithms
Class HMACSHA1
Description Hash-based Message Authentication Code using SHA1. Used to determine whether a message sent over an insecure channel has been tampered with, provided that the sender and receiver share a secret key. HMACSHA1 accepts keys of any size, and produces a hash sequence of length 20 bytes. Message Authentication Code using TripleDES. Like HMACSHA1, MACTripleDES is used to determine whether a message sent over an insecure channel has been tampered with, provided that the sender and receiver share a secret key. MACTripleDES uses a key of length 8, 16, or 24 bytes, and produces a hash sequence of length 8 bytes.
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