From mboxrd@z Thu Jan 1 00:00:00 1970 MIME-Version: 1.0 In-Reply-To: <7bffd90986cd11342f8d01fbd53e84e0@quanstro.net> References: <52ff22213469a7c44664b00697c28256@proxima.alt.za> <7bffd90986cd11342f8d01fbd53e84e0@quanstro.net> Date: Wed, 4 Feb 2009 17:40:01 +0900 Message-ID: <140e7ec30902040040m64175f7eq771bf87b38153669@mail.gmail.com> From: sqweek To: Fans of the OS Plan 9 from Bell Labs <9fans@9fans.net> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Cc: lucio@proxima.alt.za Subject: Re: [9fans] Sources Gone? Topicbox-Message-UUID: 9524c45e-ead4-11e9-9d60-3106f5b1d025 On Tue, Feb 3, 2009 at 9:54 PM, erik quanstrom wrote: >> Yes, but the content isn't guaranteed to be from a single user. In >> fact, venti has no clue. Change that and it's not venti anymore. > > exactly. but it's important to note that it's crypto hard to guess > somebody else's block. Is it? Well, to guess a specific block, obviously. I'm pretty ignorant about the structures used to store trees in venti - would it be possible to reconstruct the block containing the root of a particular tree given say, /n/dump? Presumably something along the lines of "vac /n/dump/2009/0204" would suffice, but failing that you still don't need to guess exactly the block you are looking for... How long would it take to brute force a block of a tree (giving you references to lots of other blocks) from venti? -sqweek