Where is AES encryption / decryption key used?

"Marcelo ." <[email protected]>
Newsgroups gmane.network.net-snmp.user
Message-ID <[email protected]>
Where, when does exactly the AES encryption / decryption key (128 bits) take part during the encryption /decryption process, because based in the RFC3826, aparently both processes are based in the use of the initialization vector which is formed independently of the AES key (with  the snmpEngineTime, snmpEngineBoots and an arbitrary 64 bits value initialized at boot time).
Please someone have any idea of this?

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