流加密的分类

命名空间为：
System.Security.Cryptography
种类：
1、DESCryptoServiceProvider
2、RC2CryptoServiceProvider
3、RijindaelManaged
4、TripleDesCryptoServiceProvider
5、SymmetricAlgorithm(默认)

SymmetricAlgorithm.Create()的种类(Create的参数)
DES
http://msdn.microsoft.com/library/CHS/cpref/html/frlrfsystemsecuritycryptographydesclasstopic.asp

RC2
http://msdn.microsoft.com/library/CHS/cpref/html/frlrfsystemsecuritycryptographyrc2classtopic.asp

Rijndael
http://msdn.microsoft.com/library/CHS/cpref/html/frlrfsystemsecuritycryptographyrijndaelclasstopic.asp

TripleDES
http://msdn.microsoft.com/library/CHS/cpref/html/frlrfsystemsecuritycryptographytripledesclasstopic.asp

各种类加密的Key和IV的宽度
Rijndael              Key:32    IV:16
RC2                    Key:16    IV:8
DES                    Key:8      IV:8
TripleDES           Key:16    IV:16