Perry, I will not waste anymore of your time, or mine - Since you seem to know everything about everything, there is no need in talking in circles - You may think that you know everything there is to know about encryption, but believe me, there is a lot more for you to learn - I do not now what KDC's are, I presume some sort o Key Delivery Codes. or Systems, but? I would like to find out though - send us some literature and we will send you a free demo system- that is the differece between you and us - we know very little and want to know more you know everythinh there is to know - and do not need to know anymore - Incidentally crypto wheel systems are stillemployed in 1996 at some of the highest levels of usage - some called then rotors at one time - they are still used because the produce non repeatable sequeces - the fact that ROMs are userd insteaed of rotors does not change the basic nature of such systems, they depend upon the generation of random, nonrepeatable sequences, which they can do, much faster and much more securely ythan RSA systems, I like RSA systems, they have application - but they are not the begin all and end all of encryption technology - good luck