I've been reading a lot about the authentication and privacy processes in
snmpv3 messages (RFC3414). I have a lot of questions but I'm going to begin
with the very basic ones, because those are the basis for the rest of concepts.
Is the password (8 bits long) related to some user and the secret auth key the
same thing? In the document it says that the secret auth key (20 bytes long) is
used to calculate the digest of the message, that is sent with the message to
the recipient in the field authentication parameters (12 octects).
For example, I have installed whatsup gold program and inside I have configured
a user Root with a password "mypass12", and a remote router is monitored with
that program, obviously, the router has configured a user Root with that
password too. So, I though that the password and the message were computed
together into a hash function to produce the digest message; but reading the
document, it seems that an auth key (perhaps a digest result of the user +
password) is the real value that is appended to the original message before the
hashing function produces the digest... Please can someone clarify this to me?
I'm confused.
For the moment, that is the question, with that clarified, I can have more
discernment to ask a little bit about this topic and have a very clear picture
of the authentication functionality of USM module. Thanks in advance
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