Re: [Cfrg] request for comments on "Generation of Deterministic Initialization Vectors (IVs) and Nonces"
"Dan Harkins" <dharkins@lounge.org> Wed, 20 July 2011 18:36 UTC
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Date: Wed, 20 Jul 2011 11:36:46 -0700
From: Dan Harkins <dharkins@lounge.org>
To: Peter Gutmann <pgut001@cs.auckland.ac.nz>
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Cc: mcgrew@cisco.com, cfrg@irtf.org, pgut001@cs.auckland.ac.nz
Subject: Re: [Cfrg] request for comments on "Generation of Deterministic Initialization Vectors (IVs) and Nonces"
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Hi Peter, On Wed, July 20, 2011 12:50 am, Peter Gutmann wrote: > "Dan Harkins" <dharkins@lounge.org> writes: > >>Let me remind everyone of SIV mode*. It's a CTR mode derivative but is >>resistant to nonce misuse. Unlike CBC, the nonce doesn't need to be >>unguessable. And it even provides a strong assurance of security if the >> nonce >>is reused. > > Doesn't SIV require the entire message to be buffered, which makes it > unusable > in streaming implementations? > > [Checks] > > Unless I've misinterpreted some part of Fig.3 and Fig.8 of RFC 5297, this > can't be used in a streaming implementation because the CMAC operation to > create the IV has to make a complete pass over the message before you can > start encrypting (this is also similar to a key-wrap mechanism that Colin > Plumb and I came up with for RFC 3211, although it'd need a tweak to use a > proper MAC for full integrity-protection, it was designed for > non-expanding > 512-byte disk sector encryption and dates from the early 1990s, so it > predates > pretty much all of the work that newer modes and mechanisms are built on). > SIV is quite nice for something like 802.11, SRTP, DTLS, and others, but > unfortunately won't work as a general-purpose mechanism. You're correct. All the AAD and plaintext must be known prior to invocation of the encrypt function. > Are there any IP issues around SIV? Not that I know of. The inventors have made the following statement on the subject of IP. http://csrc.nist.gov/groups/ST/toolkit/BCM/documents/proposedmodes/siv/ip.pdf regards, Dan.
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- Re: [Cfrg] request for comments on "Generation of… Peter Gutmann