  Electric Vehicles (EVs) are more and more charged at public Charge Points
(CPs) using Plug-and-Charge (PnC) protocols such as the ISO 15118 standard
which eliminates user interaction for authentication and authorization.
Currently, this requires a rather complex Public Key Infrastructure (PKI) and
enables driver tracking via the included unique identifiers. In this paper, we
propose an approach for using Self-Sovereign Identities (SSIs) as trusted
credentials for EV charging authentication and authorization which overcomes
the privacy problems and the issues of a complex centralized PKI. Our
implementation shows the feasibility of our approach with ISO 15118. The
security and privacy of the proposed approach is shown in a formal analysis
using the Tamarin prover.
