You can improve the security for data transit or storing by implementing encrypting techniques. Basically there are two approaches when using System.Security.Cryptography: symmetric and asymmetric.

Symmetric Encryption

This method uses a private key in order to perform the data transformation.

Pros:

• Symmetric algorithms consume less resources and are faster than asymmetric ones.
• The amount of data you can encrypt is unlimited.

Cons:

• Encryption and decryption use the same key. Someone will be able to decrypt your data if the key is compromised.
• You could end up with many different secret keys to manage if you choose to use a different secret key for different data.

Under System.Security.Cryptography you have different classes that perform symmetric encryption, they are known as block ciphers:

• AesManaged (AES algorithm).
• AesCryptoServiceProvider (AES algorithm FIPS 140-2 complaint).
• DESCryptoServiceProvider (DES algorithm).
• RC2CryptoServiceProvider (Rivest Cipher 2 algorithm).
• RijndaelManaged (AES algorithm). Note: RijndaelManaged is not FIPS-197 complaint.
• TripleDES (TripleDES algorithm).

Asymmetric Encryption

This method uses a combination of public and private keys in order to perform the data transformation.

Pros:

• It uses larger keys than symmetric algorithms, thus they are less susceptible to being cracked by using brute force.