> How to decrypt the passwd key of an a usmuser that had been encrypted
> if the application requires to do so...??

Nope - you can't do that.
SNMPv3 authentication doesn't work that way.

The password is used to generate a (localised) key which
is then used to generate a digital checksum for each message.

Both of these stages are one-way - you can't use the signature
of a message to get the localised key,  and you can't use the
localised key to get the pass phrase.

Dave



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