What is the access protocol in Coinbase?

Could you elaborate on the access protocol implemented by Coinbase? As a leading cryptocurrency exchange, I'm curious to understand the security measures they have in place to safeguard user accounts and transactions. Specifically, what authentication methods do they utilize? Do they offer multi-factor authentication or any other advanced security features? Also, what kind of encryption technology do they employ to ensure the confidentiality of user data? Understanding these details would help me assess the overall security posture of Coinbase and its ability to protect against potential threats.