[mnet-devel] Re: [web-calculus] YURLs

[Trevor Perrin]

At 07:22 PM 7/20/2003 -0400, Zooko wrote:

[...]
>So here is a proposal -- the last 20 bytes of the inode are the HMAC of the
>rest of the inode with the symmetric key.  This is the simplest solution
>I can think of which preserves our requirements for mnet URIs and which 
>allows
>us once again to say "Either the resulting file is the original file or an
>attacker has found a collision in SHA1.".

Never mind what I said last time.  If you add a MAC to the inode, you don't 
need to also add a MAC to the shares, cause the inode commits to a specific 
set of shares.  So I think your proposal's fine, if you want to even bother 
grooming something this insignificant out..

Trevor 



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