On 01/08/2019 10:56, Gareth's was W7 now W10 Downstairs Computer wrote:

I've been giving some thought as to how to
protect one's privacy from the ever growing
snoopings

No harm in that...

1. In case of computers being seized, you have to
guard against previous data being scattered around
the disk in various deletions. The solution here would
be to store all data in an indexed data base file of
such a size that it won't be moved willy nilly by
the OS. Then, by overwriting records at fixed and
known locations, previous data can be guaranteed
to be deleted.

2. When receiving encyphered messages, the one-time key
is to be the previously received message, giving only
one opportunity to read your message before it takes the
place of the previously received message at the fixed
location in the indexed data base.

3. Still working on data that has to be kept indefinitely,
watch this space.

While I understand the desire, these are far from trivial problems to
solve, and your suggestions in 1 and 2 above suggest you are currently
sufficiently out of your depth in this particular domain, as to make any
solutions less than useful.

Most people are capable of devising a security system so good that they
themselves could not break it... alas that does not mean it is free from
flaws or of any practical use, or that a security researcher or
cryptanalyst would not compromise it in five minutes.


--
Cheers,

John.

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