Master Data Guard is a financial data protection product developed by NSKnox, focused on securing vendor and payment master data against unauthorized modifications and fraud. The product is designed to address risks associated with business payment fraud, particularly scenarios where attackers manipulate vendor bank account details or payment records to redirect funds. Master Data Guard works by validating and protecting the integrity of master data — such as vendor records and banking information — used in enterprise payment processes. Key functions include continuous monitoring and verification of payment master data to detect unauthorized changes, ensuring that financial transactions are executed against legitimate and verified account details. The solution targets threats such as business email compromise (BEC), insider fraud, and social engineering attacks that target payment workflows. Master Data Guard is intended for enterprise environments where accounts payable and treasury operations process large volumes of vendor payments, providing controls to prevent fraudulent alterations to payment data before transactions are executed.