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I'm trying to initialize RSACryptoServiceProvider with my own public and private keys. As far as I could research, the way to do this is to call the constructor with RSACryptoServiceProvider RSAalg = new RSACryptoServiceProvider(cspParams); cspParams as shown above. However, when I look at the msdn example on the use of it: http://msdn.microsoft.com/en-us/library/ca5htw4f.aspx I don't see any place where they set the private or public keys. Only using a KeyContainer. When I create an RSACryptoServiceProvider without a cspParam, then it is by default set to only use a Public key. I notice this when I check the PublicOnly variable on the class itself and it is a read only variable. My question is how do I initialize this class and then set my own private and public keys. The server will be using the private key and the client will have the public key. What I found out is that creating an RSAParameter object and setting the .Exponent and .Modulus parameters on it as the public and private variables respectively. But I'm getting a "Missing Private Key" error since I believe the RSACryptoServiceProvider isn't initialized with the correct constructor. Below is some of my code. Don't worry about BigInteger class, it's just an experiment. Even if I use it or not, I get the same error. //Create a UnicodeEncoder to convert between byte array and string. UnicodeEncoding ByteConverter = new UnicodeEncoding(); byte[] dataToEncrypt = ByteConverter.GetBytes(password); byte[] encryptedData; byte[] decryptedData; //RSACryptoServiceProvider RSA = new RSACryptoServiceProvider(); RSAParameters rsap = new RSAParameters(); BigInteger n = new BigInteger("19579160939939334264971282204525611731944172893619019759209712156289528980860378672033164235760825723282900348193871

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