From mboxrd@z Thu Jan 1 00:00:00 1970 Message-ID: Date: Sat, 19 Feb 2005 15:15:38 -0500 From: Russ Cox To: Fans of the OS Plan 9 from Bell Labs <9fans@cse.psu.edu> Subject: Re: [9fans] Venti security in view of SHA-1 exploit In-Reply-To: <9e8b82886fac51f78a70e17b6ba26813@telus.net> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit References: <20050219183814.GISZ2048.imf19aec.mail.bellsouth.net@p1.stuart.org> <9e8b82886fac51f78a70e17b6ba26813@telus.net> Topicbox-Message-UUID: 4ecbec9a-eace-11e9-9e20-41e7f4b1d025 Conversion is made quite easy (compared to other systems I am familar with) because the blocks are tagged with their type (data, SHA1 hashes of data, SHA1 hashes of hashes of data) and the block tree is a standardized format used by all clients, so conversion can happen independent of the program that wrote the data. After converting the data, all the clients and the server would have to be rebuilt with the new hash function. It is not necessary to write a separate program to convert fossil data, vac data, etc. Some day it will be necessary to worry about this. It is not today. Russ