Kamal R. Prasad wrote:
Hello,

I just got myself a Thawte freemail 2048-bit key.

You got a Thawte freemail *certificate* that contains a copy of *your* key. You supplied the key. Thawte supplied the certificate.

> I have enabled
signing and encryption in mozilla mail agent. I need some more info
like:-

(a) what do I post on my website for anybody to securely contact me? I
can see a SHA1 fingerprint and an MD5 fingerprint.

You post the certificate.


(b) Does the 2048-bit key pose a problem for those using 1024-bit
capable software? ie am I ahead of times?

All the major S/MIME email software handles 2k bit keys, AFAIK. Netscape & mozilla S/MIME clients have always handled 2k bit keys (subject to export control constraints back in the 1990s)

(c) I registered my thawte key using one computer, but I may use more
than one computer. How do I use the same key across various computers?

You export your private key and certificate in a .p12 file, and then import it on whatever computers you wish. Alternatively, you put it into a hardware crypto device and carry that with you.

(d) is this (cert) something that can be used to filter out
junk/spam/flame mail too?

Not at this time. Julien has proposed that if people routinely rejected all signed email, and only accepted signed email, that would kill spam, and I believe that would work, but not enough people use certs yet.

--
Nelson B

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