in app (Java) crypt "file store"/ media cache ?

[Zenaan Harkness]

On Tue, Jul 07, 2020 at 01:09:06PM +1000, jamesd at echeque.com wrote:
> > On Mon, Jul 06, 2020 at 11:15:01PM +0000, таракан wrote:
> >> I develop an embedded system for a secure communication station.
> >> I want everything to stays transient, to be erased as soon and as fast as possible.
> 
> The authorities are more interested in the metadata, who is
> communicating with whom.  To reduce the value of this information, needs
> to be embedded in a flood of unimportant chats.

Indeed.


> On 2020-07-07 11:55, Zenaan Harkness wrote:
> > This distributed/decentral content is interesting - I've been thinking of "cache" as the local node's "contribution" to the distributed P2P content store.
> 
> The strong cure for revealing metadata is to embed private
> communications in a pool of everyone to everyone public communications.
> 
> Suppose everyone interested in signing or encrypting their tests in this
> pool as a Zooko identity.

Thanks for the Zooko reference - these days, the flood of material can be a problem to getting up to speed.. had yet to see the name Zooko - Keybase being read now (just not a social media user here..)


> Encrypted messages are dumped into the pool with everything else, and
> downloaded by everyone, but if he does not have a key that can decrypt
> an encrypted message, his client does not show him that message.
> 
> Let S be curve25519 public key of the sender, R the public key of the
> recipient, r and s the corresponding private keys.
> 
> The message starts with S.  It is encrypted using the symmetric key s*R.
> 
> The recipient client software tries the symmetric key r*S, which, if the
> message is for him rather than someone else, is going to equal s*R.  If
> it does not work, obviously for someone else.

Keybase solves certain problems in apparently right ways. Thanks again,