Hello,
as far as I know, Thunderbird sends encrypted e-mails as an attachment
named "smime.p7m".
Can anybody let me briefly know what this file contains? I know this
from previous e-mail conversation from this mailing list:
"The sender generates an ephemeral 3-DES key one for each receiver, then
encrypts (wraps) each key using that receivers' RSA public key. In order
to read a message, you have to decrypt (unwrap) the 3-DES key that was
encrypted using your RSA public key. Then, you have to decrypt the
messsage using the 3-DES key you just unwrapped."
Does that mean the p7m file contains multiple copies of the same
message, each copy encrypted using a different key?
Also, it looks like it contains some certificates. Unfortunately, the
software I am using (ASN.1 Editor) doesn't read the p7m file despite the
fact that it looks as a DER-encoded file at a first glance (even after
removing the zero-byte padding).
Anyone can shed some light on the contents of "smime.p7m" ?
Thanks in advance,
M. Kurpel
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