From: Eric Biggers <ebiggers@kernel.org>
To: Nathan Huckleberry <nhuck@google.com>
Cc: linux-crypto@vger.kernel.org, linux-fscrypt@vger.kernel.org,
Herbert Xu <herbert@gondor.apana.org.au>,
"David S. Miller" <davem@davemloft.net>,
linux-arm-kernel@lists.infradead.org,
Paul Crowley <paulcrowley@google.com>,
Sami Tolvanen <samitolvanen@google.com>,
Ard Biesheuvel <ardb@kernel.org>
Subject: Re: [PATCH v5 8/8] fscrypt: Add HCTR2 support for filename encryption
Date: Sun, 1 May 2022 11:37:40 -0700 [thread overview]
Message-ID: <Ym7TdNCe/3gXdVNr@sol.localdomain> (raw)
In-Reply-To: <20220427003759.1115361-9-nhuck@google.com>
On Wed, Apr 27, 2022 at 12:37:59AM +0000, Nathan Huckleberry wrote:
> HCTR2 is a tweakable, length-preserving encryption mode that is intended
> for use on CPUs with dedicated crypto instructions. HCTR2 has the
> property that a bitflip in the plaintext changes the entire ciphertext.
> This property fixes a known weakness with filename encryption: when two
> filenames in the same directory share a prefix of >= 16 bytes, with
> AES-CTS-CBC their encrypted filenames share a common substring, leaking
> information. HCTR2 does not have this problem.
>
> More information on HCTR2 can be found here: "Length-preserving
> encryption with HCTR2": https://eprint.iacr.org/2021/1441.pdf
>
> Signed-off-by: Nathan Huckleberry <nhuck@google.com>
> Reviewed-by: Ard Biesheuvel <ardb@kernel.org>
Acked-by: Eric Biggers <ebiggers@google.com>
- Eric
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prev parent reply other threads:[~2022-05-01 18:38 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-04-27 0:37 [PATCH v5 0/8] crypto: HCTR2 support Nathan Huckleberry
2022-04-27 0:37 ` [PATCH v5 1/8] crypto: xctr - Add XCTR support Nathan Huckleberry
2022-04-27 0:37 ` [PATCH v5 2/8] crypto: polyval - Add POLYVAL support Nathan Huckleberry
2022-04-27 0:37 ` [PATCH v5 3/8] crypto: hctr2 - Add HCTR2 support Nathan Huckleberry
2022-05-01 18:33 ` Eric Biggers
2022-05-02 18:25 ` Eric Biggers
2022-04-27 0:37 ` [PATCH v5 4/8] crypto: x86/aesni-xctr: Add accelerated implementation of XCTR Nathan Huckleberry
2022-05-01 21:31 ` Eric Biggers
2022-04-27 0:37 ` [PATCH v5 5/8] crypto: arm64/aes-xctr: " Nathan Huckleberry
2022-05-01 22:08 ` Eric Biggers
2022-04-27 0:37 ` [PATCH v5 6/8] crypto: x86/polyval: Add PCLMULQDQ accelerated implementation of POLYVAL Nathan Huckleberry
2022-05-01 20:43 ` Eric Biggers
2022-05-02 18:08 ` Eric Biggers
2022-04-27 0:37 ` [PATCH v5 7/8] crypto: arm64/polyval: Add PMULL " Nathan Huckleberry
2022-05-01 20:21 ` Eric Biggers
2022-05-02 18:11 ` Eric Biggers
2022-04-27 0:37 ` [PATCH v5 8/8] fscrypt: Add HCTR2 support for filename encryption Nathan Huckleberry
2022-05-01 18:37 ` Eric Biggers [this message]
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