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Notification payloads IV



	How is the IV computed for notification messages in IKE Phase I?
I know in phase II it's computed: 
"using the hash of a concatenation of the last Phase I CBC block
concatenated and the message id in the ISAKMP header" (RFC 2409 Apendic B)
	However, I'm not really sure how to do it for Phase I when
encryption is applied (messages 5 and 6) and an error is found.
Is it explained somewhere? 

Toni


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