[Cryptography] Best/simplest document encryption

[Thierry Moreau]

On 21/03/19 08:54 PM, Henry Baker wrote:
> Hi all:
>
> Here's the most basic crypto question of all:
>

You start with a basic question, and then you add a plethora of 
additional requirements.

>
> I.e., there are *senders* and *receivers*:
>
> Senders can encrypt & send
>
> Receivers can decrypt & receive

That's the basic question.

Basic answer: good local random source, Diffie-hellman exchange with 
out-of-band public key integrity check, conventional AES encryption with 
AEAD scheme. This is the implementation I came with when I felt the need 
to do the exercise of addressing the basic question as simply as possible.

Otherwise, train users with GPG (untrained users will be exposed to data 
leaks in any scheme).

Regards,

- Thierry