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SNMP v3 Encryption of encoded messages

Posted on 2016-10-13
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Last Modified: 2016-11-03
I need to research whether any devices that use SNMPv3 perform 3 steps:
1. encode SNMP messages to get an encoded message
2. encrypt the encoded message from step 1 to get the encrypted message
3. encode the encrypted message from step 2.

Thoughts?
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Question by:cyber-33
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Expert Comment

by:David Johnson, CD, MVP
ID: 41842915
only if authPriv is enabled and configured (you should use AES and not DES)
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Author Comment

by:cyber-33
ID: 41848904
Interesting. David, why use AES and not DES?

Another question I have what is the scenario, where the encrpted message (encryptedPDU) would represent the encoded message, as opposed to representing plain data (scopedPDU) ?

My concern is that the plain data is being encrypted PRIOR to it is encoded into the SNMP message format.... In other words, step 2 provided in the question is performed before step 1....

Thank you for your help.
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Accepted Solution

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David Johnson, CD, MVP earned 2000 total points
ID: 41849322
DES has been considered vulnerable for a long time because the time required to crack an encryption algorithm is directly related to the length of the key used to secure the communication. AES allows you to choose a 128-bit, 192-bit or 256-bit key, making it exponentially stronger than the 56-bit key of DES.
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