[tahoe-dev] Mail on Tahoe?

[Pierre Abbat]

On Saturday, June 08, 2013 21:34:09 Kevin Reid wrote:
> There is no mutable primitive in Tahoe which has this property. There's an
> idea for append-only/add-only collections (which would be sufficient),
> <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/795>, but this has not yet
> been implemented.

Here's another idea. Alice and Bob and everyone else have Diffie-Hellman keys in 
the same field. They all publish their public keys in some directory. Alice 
wants to send a message to Bob. Alice finds Bob's public key and computes their 
shared key, which points to a dircap readable and writable by Alice and Bob 
but unknown to everyone else. There Alice puts her message and Bob reads it.

This doesn't prevent Alice from deleting a message she sent to Bob, but it 
does prevent Carol from reading or deleting messages sent between Alice and 
Bob.

Pierre
-- 
Don't buy a French car in Holland. It may be a citroen.