Where, when does exactly the DES encryption / decryption key (64 octets) take
part during the encryption /decryption process, because aparently both
processes are based only in the initialization vector ?
As you might know, according the RFC3414, from the DES localized key of 16
octets, the first 8 are used as DES encryption / decryption key (this is the
only mention of this key in the document); and the final 8 are used as pre -
initialization vector (pre IV) . The final initialization vector (8 octets) is
obtained from operations made in the pre IV using the snmpEngineBoots of 4
octets and an arbitrary 4 octets value initialized at boot time.
Please someone can help me explaining when is exactly the DES key used during
the encryption and decryption of the messages?
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