Resistant AI, a Prague-based security company that protects AI systems from cyberattacks and fraud, has raised $2.75 million in a round co-led by Index Ventures and Credo Ventures. Seedcamp and angel investors such as Daniel Dines and Michal Pechoucek also participated. Deployed on top of existing systems, Resistant AI provides a typical security layer for financial services, such as protecting payments and detecting fraud or money laundering -- and also detects forged documents or spots sophisticated attackers attempting to copy the underlying ML model. "Historically, all systems that make high-value financial decisions become targeted. This is already happening with the automated systems deployed by our fintech and financial customers and we are here to protect them," says Martin Rehak, the startup's co-founder and CEO.