Strengthening Digital Identity Act of 2020 This bill directs the National Institute of Standards and Technology (NIST) to continue a cybersecurity program to support the development of voluntary and cost-effective management standards, metrology, testbeds, and conformance criteria, taking into account appropriate user concerns. NIST shall develop and implement a comprehensive forward-looking investment strategy for identity management research and development and standards focused on enabling the use and adoption of modern digital identity solutions that align with criteria set forth by this bill. NIST shall develop, and periodically update, a framework of standards, methodologies, procedures, and processes as a guide for federal, state, and local governments to follow when providing services related to digital identity verification.