----- Forwarded message from Zooko Wilcox-O'Hearn <zo...@zooko.com> -----
From: Zooko Wilcox-O'Hearn <zo...@zooko.com>
Date: Wed, 11 Jul 2012 15:08:33 -0300
To: Tahoe-LAFS development <tahoe-...@tahoe-lafs.org>
Subject: Re: [tahoe-dev]
“On the limits of the use cases for authenticated encryption”
Reply-To: Tahoe-LAFS development <tahoe-...@tahoe-lafs.org>
I've been thinking about this more, including re-reading BenL's post
to tahoe-dev. I was inspired by hearing that Tahoe-LAFS's use case had
been discussed at the recent "Directions in Authenticated Ciphers"
workshop:
http://hyperelliptic.org/DIAC/
I've decided that I wasn't really on the right track to say
"Authenticated Encryption is useless for Tahoe-LAFS use cases", and
instead I should say "We need *public key* Authenticated Encryption
instead of *symmetric key* Authenticated Encryption for Tahoe-LAFS use
cases".
• symmetric-key Authenticated Encryption = Message Authentication Code + cipher
• "signcryption" = digital signature + public key encryption
• Tahoe-LAFS mutable = digital signature + cipher
• Tahoe-LAFS immutable = data identified by its secure hash + cipher
Regards,
Zooko
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----- End forwarded message -----
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Eugen* Leitl <a href="http://leitl.org";>leitl</a> http://leitl.org
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