1. To make a test certificate, use the makecert.exe tool makecert -n "CN=My Company" -ss "MyCompany.com" -pe -sr LocalMachine -sky Exchange test.cer Here the -sky Exchange parameter is very important, without this, the generated certificate can only be used for signing, but not for encrypting/decrypting. 2. Write C# code as following: public class CertificateSSO { private X509Certificate2 GetCertificate() { X509Store store = new X509Store(" MyCompany .com", StoreLocation.LocalMachine); store.Open(OpenFlags.OpenExistingOnly); X509Certificate2 cert = store.Certificates.Find(X509FindType.FindBySubjectName, "My Company", false)[0]; store.Close(); return cert; } public string Encrypt(string strPlainText) { X509Certificate2 cert = GetCertificate(); using (RSACryptoServiceProvider provider = (RSACrypto
