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Re: [Users] IKE Quick Mode ( Phase 2 )

From: Martin Peikert (Martin.Peikert_at_discon.de)
Date: Mon May 06 2002 - 10:27:10 CEST


Gianluca Scuto wrote:

> 1) After IKE phase 1 ( Main Mode ) , I have already accomplished the
> negotiations of encryption, hashing and authentication algorithms, the
> public keys and random numbers for D.-H. exchange and the authentication
> of the two parties ( It's correct, isn't it ? ). The following Quick
> Mode phase 2 is needed only for refreshing keys, isn't it ? To be clear,
> which is the scope of Quick Mode phase 2 ? What exactly do I need to
> send in the three messages of Quick Mode phase 2 ? Unfortunately the
> paragraph 5.5 of rfc 2409 is not so clear for me.

IIRC in phase 2 the security associations (SA) for ESP/AH are
negotiated. If you use PFS a new D.-H. process is used to generate the
keys used by ESP/AH. All that stuff is encrypted with the keys generated
in phase 1.

> 2) What does the ISAKMP header contain ? What exactly are the cookies
> and the message ID in it ?

Isn't that described in rfc 2408 - ISAKMP?

> 3) When can I start to send IP datagram on my IPSec tunnel ? After phase
> 1 or phase 2 ?

After Phase 2.

HTH
GTi

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