RPX led the round, joining existing shareholders in cybersecurity platform Tyfone including HDFC and Polaris Software Lab.

US-based cybersecurity company Tyfone raised $6.6m in a series C round led by patent risk management services provider RPX on Monday.

In-Q-Tel, the venture capital fund investing on behalf of US Central Intelligence Agency (CIA), also contributed funding alongside a range of individual investors including retired general David Petraeus. The round is officially still open to additional investors.

Founded in 2004, Tyfone has built an online security platform that facilitates identity authentification and contactless financial transactions using devices such as…