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Please answer the question....

I am a student in korea.
reply address :
       u9202205@xxxxxxxxxxxxxxxxxx

I want to know about the meaning of below words.

1) PGP/MIME
2) S/MIME
3) Non-repudiation of Receipt (NRR)
4) MIME envelope

and what is a difference between DES and RSA public key ?
I've already read description of internet drafts.
But I don't understand of listed words.

Please contact to me soon!!!!