static RSAParameters rsaParamsExcludePrivate1;
static RSAParameters rsaParamsIncludePrivate1;

产生RSA参数：
RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();
//得到公钥
rsaParamsExcludePrivate=rsa.ExportParameters(false);
//得到私钥
rsaParamsIncludePrivate=rsa.ExportParameters(true);

ViewState["rsaParamsExcludePrivate"]=ClassSerializer.BinarySerializer(rsaParamsExcludePrivate);
ViewState["rsaParamsIncludePrivate"]=ClassSerializer.BinarySerializer(rsaParamsIncludePrivate);

加密：


RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();
rsaParamsExcludePrivate1=(RSAParameters)ClassSerializer.BinaryDeserialize((string)ViewState["rsaParamsExcludePrivate"]);

rsa.ImportParameters(rsaParamsExcludePrivate1);
if(TB1.Text!="")
{        //要加密的数据
DataToEncrypt=ByteConverter.GetBytes(TB1.Text);
                                    //加密
EncryptedData=rsa.Encrypt(DataToEncrypt,false);
TB2.Text=ByteConverter.GetString(EncryptedData);
DB.Enabled=true;
TB3.Text=DisplayByteArray(EncryptedData);
NewB.Enabled=false;
CB.Enabled=false;
TB1.ReadOnly=true;
TB1.Enabled=false;
}
else
{
TB2.Text="No data to encrypt!";
TB3.Text="No data to encrypt!";
TB4.Text="No data to encrypt and no data to decrypt!";
DB.Enabled=false;
}
byte [] TB2Byte=ByteConverter.GetBytes(TB2.Text);
if(TB2Byte.Length==128) //RSA参数为1024位时
SaveB.Enabled=true;
else
SaveB.Enabled=false;
解密：

RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();

rsaParamsIncludePrivate1=(RSAParameters)ClassSerializer.BinaryDeserialize((string)ViewState["rsaParamsIncludePrivate"]);

rsa.ImportParameters(rsaParamsIncludePrivate1);
                           //解密
DecryptedData=rsa.Decrypt(EncryptedData,false);//此时出错
TB4.Text=ByteConverter.GetString(DecryptedData);
DB.Enabled=false;
CB.Enabled=true;
NewB.Enabled=true;
TB1.Enabled=true;
TB1.ReadOnly=false;
SaveB.Enabled=false;

序列化方法：

/// <summary> 
/// Binary格式的序列化 
/// </summary> 
/// <param name="o"></param> 
/// <returns></returns> 
public static string BinarySerializer(object o) 
{ 
// To serialize the hashtable and its key/value pairs,  
// you must first open a stream for writing. 
// In this case, use a file stream. 
//FileStream fs = new FileStream("DataFile.xml", FileMode.Create); 
Stream ms=new MemoryStream(); 
// Construct a BinaryFormatter and use it to serialize the data to the stream. 
BinaryFormatter formatter = new BinaryFormatter(); 
try 
{ 
formatter.Serialize(ms, o); 
   
byte[] b=new byte[ms.Length]; 
ms.Position=0; 
ms.Read(b,0,b.Length); 
                
string s=Convert.ToBase64String(b); 
return s; 
} 
catch (SerializationException e) 
{ 
//Log.Write("ServiceNode:Exception","Failed to serialize. Reason: " + e.Message); 
throw e ; 
} 
finally 
{ 
ms.Close(); 
} 
} 

/// <summary> 
/// Binary格式的反序列化 
/// </summary> 
/// <param name="returnString"></param> 
/// <returns></returns> 
public static object BinaryDeserialize(string returnString) 
{ 

// Open the file containing the data that you want to deserialize. 
BinaryFormatter formatter; 
MemoryStream ms=null; 
try 
{ 
formatter = new BinaryFormatter(); 

byte[] b=Convert.FromBase64String(returnString); 

ms=new MemoryStream(b); 
    
// Deserialize the hashtable from the file and 
// assign the reference to the local variable. 
object response = formatter.Deserialize(ms); 
return response; 
} 
catch (SerializationException e) 
{ 
//Log.Write("ServiceNode:Exception","Failed to deserialize. Reason: " + e.Message); 
throw e; 
} 
finally 
{ 
ms.Close(); 
    
} 

}