Martin Kacer is Core Network Security Researcher performing security services and trainings for mobile operators. Contributor to GSMA (e.g. Diameter message categories) and to wireshark project. In past working for telecom operator on core network and latter on security department with focus on protection of the telecom network against signalization attacks. More than 15 years of experience with telecom signalization, protocol stacks, designing the signaling IDS, signaling firewall, fraud detection and also in past developing network elements and signalling probes.