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Date: Fri, 30 Sep 2016 18:05:33 -0400 From: Theodore Ts'o <tytso@....edu> To: Richard Weinberger <richard@....at> Cc: linux-ext4@...r.kernel.org, linux-fsdevel <linux-fsdevel@...r.kernel.org>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, Eric Biggers <ebiggers@...gle.com>, David Gstir <david@...ma-star.at> Subject: Re: Question on ext4 directory hashes in combination with file name encryption On Fri, Sep 30, 2016 at 04:09:09PM +0200, Richard Weinberger wrote: > > if I read the ext4 code correctly, you pass encrypted filenames to ext4fs_dirhash(). > These filenames are not encoded and therefore binary gibberish. That's correct. > Isn't this a problem for the ext4 hash functions? My fear is that these hashes are optimized > for ASCII strings and produce more collisions when binary data is used as input. I'm not particularly worried. In general, while the converse is true; that hashes that assume that they are used for binary data might not work as well for ASCII strings, the ext4 hash functions should work fine for binary data. - Ted -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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