Hello, I have an application that needs to write a private RSA key onto a SmartCard. I am using 128 byte keys. I noticed that if I export the RSAParameters from the RSACryptoServiceProvider and only save the D, I am unable to Import it later and use it as a private key. It is also not feasable to write to the smar card all of the members of RSAParameter since this would take about 500 bytes and I don't see why it would be needed. The options I see are saving the P, Q and Exponent but I don't see any functions in RSACryptoServiceProvider that will recalculate the keys using these, or save only D and be able to use it. Any advice on this? Thanks, Jeronimo