Re: [GNUnet-developers] Updatability

[Christian Grothoff]

On Tuesday 07 May 2002 03:55 pm, you wrote:
> On Tue, 7 May 2002, David Findlay wrote:
> > Also
> > the ability to create a "directory" of files that only the author can
> > change or add to is a necessity.
>
> This is fairly easy to do.  Basically for each "file" in the directory:
>
> p = public key
> h(x) = secure hash function
> f = "file" name.
>
> Key Name: hash(p + f) or hash(hash(p) + hash(f)) as freenet does but
>                                                  I'm not why.
> Key data: signature of the key name
>           actual data

Directories *are* easy, doing updatability right is MUCH harder [I don't have 
a good solution for that yet, so I'm not going to elaborate. If you think you 
have one, consider how it works if adversaries try to use it to remove 
content, how you authenticate the update to all servers, how you find all the 
servers, how you deal with servers that were offline when the update arrived, 
etc, etc, etc.]

Christian
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|Christian Grothoff                                  |
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