Re: simple crypto solution(s)?

> On Mar 18, 2018, at 5:31 PM, Lister <[email protected]> wrote:
> 
> List,
> 
> I am trying to solve a little problem, but since I don't have much idea 
> about cryptography tools on linux, I would like to get some pointers 
> from this list. Also, if the problem I have develops to something big, 
> there may be a paid consulting opportunity here as well
> 
> Two entities (say A and B, non-humans) are connected through a high 
> speed, point to point, short distance (say 1m max) serial link. Both 
> entities have their own OS and file systems. I need to create a key 
> (private/public) pair and send some information (less than 256 bytes) as 
> a part of the handshake procedure between A and B (I already have a 
> custom protocol to do handshake). Also, I am not bothered about key 
> rings or publishing the public keys as the project targets a private 
> system, not connected to internet, but _CANNOT_ use symmetric keys.

I recommend getting acquainted with GnuPG, an implementation of OpenPGP.
https://www.gnupg.org/
> 
> My questions are:
> 
> How do I create a (moderately) strong key pair in linux for asymmetric 
> encryption?
There are numerous public instructions on the Web about how to create keys and move them between hosts. The link above is a start.
> 
> What are the tools used?

> 
> Do these tools have APIs and source code available (this is most important)
> 
APIs - yes. Open source code - yes.
BTW, the distance between hosts is irrelevant for GnuPG purposes.

> Thanks much,
> 
> Lister
> 
> 
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—
Mark

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