I have been given a public key ($y_1=x_1G$), but I don't yet know the private key ($x_1$). At a later time, I will get $x_1$ if some conditions are met.
Let's say I generate a new key pair $( y_2, x_2)$, both of which I will know.
Is it possible to add up these key pairs?
$ y = y_1 + x_2G$
$ x = x_1+x_2 $
Let's say (before I have $ x_1 $) I encrypt a text with $y$. And let's say I get $x_1$ at a later date. Can I decrypt my text using $x$ (by adding up the private keys)?
Let's use ECDSA key pairs. Sorry if my question is somehow deficient, but I just started to study cryptography. You would help me a lot by clarifying this question. Best, Stan