DATA ENCRYPTION 2048 RSA Algorithm using public key in mvc - asp.net

Question

i want to encrypt a json data
{
"urc": "7718313198",
"umc": "101871",
"ak": "asdfgh123456",
"fname": "Biswajit",
"lname": "Dolui",
"email": "retailer001#giblvirtualmail.com",
"phno": "7718313198",
"pin": "712410"
}

Answer 1

i could not encrypt long string in asp.net using rsa algorithm 2048
var csp = new RSACryptoServiceProvider(2048);
//how to get the private key
var privKey = csp.ExportParameters(true);
//and the public key ...
var pubKey = csp.ExportParameters(false);
//converting the public key into a string representation
string pubKeyString;
{
//we need some buffer
var sw = new System.IO.StringWriter();
//we need a serializer
var xs = new System.Xml.Serialization.XmlSerializer(typeof(RSAParameters));
//serialize the key into the stream
xs.Serialize(sw, pubKey);
//get the string from the stream
pubKeyString = sw.ToString();
}
//converting it back
{
//get a stream from the string
var sr = new System.IO.StringReader(pubKeyString);
//we need a deserializer
var xs = new System.Xml.Serialization.XmlSerializer(typeof(RSAParameters));
//get the object back from the stream
pubKey = (RSAParameters)xs.Deserialize(sr);
}
//conversion for the private key is no black magic either ... omitted
//we have a public key ... let's get a new csp and load that key
csp = new RSACryptoServiceProvider();
csp.ImportParameters(pubKey);
//we need some data to encrypt
var plainTextData = "{urc: 7718313198,umc: 101871,ak: asdfgh123456,fname: Biswajit,lname: Dolui,email: biswajitdoluicse#gmail.com,phno: 7718313198}";
//for encryption, always handle bytes...
var bytesPlainTextData = System.Text.Encoding.Unicode.GetBytes(plainTextData);
//apply pkcs#1.5 padding and encrypt our data
var bytesCypherText = csp.Encrypt(bytesPlainTextData, false);
//we might want a string representation of our cypher text... base64 will do
var cypherText = Convert.ToBase64String(bytesCypherText);