What electronic signature to choose for working with foreign customers?

Question

Electronic digital signature

I am an individual entrepreneur, my foreign customer and I want to exchange invoices and acts (and sometimes sign contracts) electronically. To do this, you need to select an electronic digital signature (EDS) and a certification authority (CA), but which one is not clear. I tried to find it on Google, but there is no information on how to work and with foreign contractors.
How can you organize it anyway?

Answer 1

The main problem is that each state has its own standards in this regard, so, most likely, the customer will have to obtain and master the Russian digital signature, and you - the foreign one.