Christian Barmala wrote:

You mention, that the data is "encrypted using the sender's private key ...
> to ensure that data is sent by the intended sender". Even though you sometimes
> find this expression in literature, I consider it clearer when you say "data is
> signed by the sender's private key".

Signing and encryption are quite different. ... well, kinda.

In an advanced szenario you might depict that the public keys involved are in turn
>signed by a CA to prevent a "man in the middle attack".

Public keys are NOT signed by a CA.  A CA signs a cert that binds a public key to
a subject.  Having observed a standard of due care, and having performed all
necessary due diligence, this offer void where prohibited, go back and stop
talking when you should be listening.


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