P&C insurers are gradually getting more sophisticated at measuring risk aggregations and modelling potential losses from catastrophic cyber events, but efficacy of this analysis is inhibited by exposure to non-affirmative or 'silent' cyber risk, Fitch Ratings said. Many insurers now view cyber insurance as an attractive source of premium growth and profits. However, future segment performance faces considerable uncertainty given the evolving nature of cyber incidents in a constantly changing technological, legal and regulatory environment.