Online casinos employ a multi-faceted approach to ensure the security of financial transactions, leveraging advanced technologies and protocols. They use encryption methods, such as Secure Socket Layer (SSL) technology, to protect sensitive data during transmission, ensuring that information like payment details remains confidential. Additionally, reputable online casinos implement robust authentication processes, including two-factor authentication (2FA) and strong password policies, to verify user identities and prevent unauthorized access. Regular audits and compliance with regulatory standards also play a vital role in maintaining security, as they ensure that the casino adheres to industry best practices.