Re: [kitten] WGLC on draft-ietf-kitten-aes-cts-hmac-sha2-06
Benjamin Kaduk <kaduk@MIT.EDU> Wed, 15 April 2015 20:58 UTC
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Date: Wed, 15 Apr 2015 16:58:08 -0400
From: Benjamin Kaduk <kaduk@MIT.EDU>
To: Nico Williams <nico@cryptonector.com>
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Cc: kitten@ietf.org
Subject: Re: [kitten] WGLC on draft-ietf-kitten-aes-cts-hmac-sha2-06
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On Wed, 15 Apr 2015, Nico Williams wrote: > On Mon, Mar 30, 2015 at 12:40:40PM -0400, Benjamin Kaduk wrote: > > This message begins the Working Group Last Call (WGLC) of "AES Encryption > > with HMAC-SHA2 for Kerberos 5" <draft-ietf-kitten-aes-cts-hmac-sha2-06>. > > The WGLC will last two weeks, ending on Monday, April 13th. The draft is > > available at: > > > > https://tools.ietf.org/html/draft-ietf-kitten-aes-cts-hmac-sha2-06 > > To summarize the changes from RFC3962: > > - CTS remains the same but is now given by a different reference > (SP800-38A+). The motivation is clear (to have a NIST reference for > the cipher mode). > > This should be the same as in RFC3962. > > (Confounding is still used.) > > - Use encrypt-then-MAC instead of MAC-then-encrypt. +1 to that. > > - SHA-256 is used at the 128-bit security level, instead of SHA-1, and > the HMAC output is truncated to 128 bits. The keys for the HMAC are > 128 bits at the 128-bit security level. > > - SHA-256 is used at the 192-bit security level, and the HMAC is > truncated to 192 bits. The keys for the HMAC are 192 bits at the > 192-bit security level. > > AES-256 is used at the 192-bit security level because AES-192 > implementations are not as universally available as AES-256, or > something. In any case, I've no objection. > > I also do not object to the use of HMAC-SHA256-192 with 192-bit keys > at the 192 bit security level. I think that some of these "256" should be "384", unless you have progressed from summarizing the document to describing what you would like to see... -Ben
- Re: [kitten] WGLC on draft-ietf-kitten-aes-cts-hm… Benjamin Kaduk
- [kitten] WGLC on draft-ietf-kitten-aes-cts-hmac-s… Benjamin Kaduk
- Re: [kitten] WGLC on draft-ietf-kitten-aes-cts-hm… Greg Hudson
- Re: [kitten] WGLC on draft-ietf-kitten-aes-cts-hm… Benjamin Kaduk
- Re: [kitten] WGLC on draft-ietf-kitten-aes-cts-hm… Greg Hudson
- Re: [kitten] WGLC on draft-ietf-kitten-aes-cts-hm… Jeffrey Altman
- Re: [kitten] WGLC on draft-ietf-kitten-aes-cts-hm… Benjamin Kaduk
- Re: [kitten] WGLC on draft-ietf-kitten-aes-cts-hm… Michael Jenkins
- Re: [kitten] WGLC on draft-ietf-kitten-aes-cts-hm… Jeffrey Altman
- Re: [kitten] WGLC on draft-ietf-kitten-aes-cts-hm… Greg Hudson
- Re: [kitten] WGLC on draft-ietf-kitten-aes-cts-hm… Weijun Wang
- Re: [kitten] WGLC on draft-ietf-kitten-aes-cts-hm… Greg Hudson
- Re: [kitten] WGLC on draft-ietf-kitten-aes-cts-hm… Luke Howard
- Re: [kitten] WGLC on draft-ietf-kitten-aes-cts-hm… Viktor Dukhovni
- Re: [kitten] WGLC on draft-ietf-kitten-aes-cts-hm… D.Rogers
- Re: [kitten] WGLC on draft-ietf-kitten-aes-cts-hm… Luke Howard
- Re: [kitten] WGLC on draft-ietf-kitten-aes-cts-hm… Viktor Dukhovni
- Re: [kitten] WGLC on draft-ietf-kitten-aes-cts-hm… D.Rogers
- Re: [kitten] WGLC on draft-ietf-kitten-aes-cts-hm… Benjamin Kaduk
- Re: [kitten] WGLC on draft-ietf-kitten-aes-cts-hm… Nico Williams
- Re: [kitten] WGLC on draft-ietf-kitten-aes-cts-hm… Nico Williams
- Re: [kitten] WGLC on draft-ietf-kitten-aes-cts-hm… Nico Williams
- Re: [kitten] WGLC on draft-ietf-kitten-aes-cts-hm… Nico Williams
- Re: [kitten] WGLC on draft-ietf-kitten-aes-cts-hm… Nico Williams
- Re: [kitten] WGLC on draft-ietf-kitten-aes-cts-hm… Michael Peck
- Re: [kitten] WGLC on draft-ietf-kitten-aes-cts-hm… Viktor Dukhovni
- Re: [kitten] WGLC on draft-ietf-kitten-aes-cts-hm… Greg Hudson
- Re: [kitten] WGLC on draft-ietf-kitten-aes-cts-hm… Nico Williams
- Re: [kitten] WGLC on draft-ietf-kitten-aes-cts-hm… Benjamin Kaduk
- Re: [kitten] WGLC on draft-ietf-kitten-aes-cts-hm… Benjamin Kaduk
- Re: [kitten] WGLC on draft-ietf-kitten-aes-cts-hm… Benjamin Kaduk
- Re: [kitten] WGLC on draft-ietf-kitten-aes-cts-hm… Benjamin Kaduk
- Re: [kitten] WGLC on draft-ietf-kitten-aes-cts-hm… Nico Williams
- Re: [kitten] WGLC on draft-ietf-kitten-aes-cts-hm… Benjamin Kaduk
- Re: [kitten] WGLC on draft-ietf-kitten-aes-cts-hm… Jeffrey Altman
- Re: [kitten] WGLC on draft-ietf-kitten-aes-cts-hm… Michael Peck
- Re: [kitten] WGLC on draft-ietf-kitten-aes-cts-hm… Greg Hudson
- Re: [kitten] WGLC on draft-ietf-kitten-aes-cts-hm… Benjamin Kaduk
- Re: [kitten] WGLC on draft-ietf-kitten-aes-cts-hm… Jeffrey Altman
- Re: [kitten] WGLC on draft-ietf-kitten-aes-cts-hm… Michael Jenkins
- Re: [kitten] WGLC on draft-ietf-kitten-aes-cts-hm… Jeffrey Altman