> i've been thinking about this for a while, and i was wondering if it is
> possible to use some form of crypto to allow someone to read and append to a
> file, but force them to have a hard-to-crack private key if they ever want to
> delete from it?
>
> thanks for the help
> matt
You are a little confused:
This is not a crypto issue. This is a OS security issue. Crypto might be
involved in authenticating the user however.
If they can read a file, they can copy it and change sections all they like.
If you want to stop them deleting sections you have to control the distrubution
(basically you can't, but there are situations where people only get the data
from a single server - so you can, from a certain point of view). Thus
when they commit the file you need to check that the first n (where n is the
current length of the file) match the first n bytes of the submitted file.
Thus, this is not a crypto issue.
AGL
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