Serviço de Informações de Segurança

The Serviço de Informações de Segurança or SIS (Portuguese for: Security Information Service) is the Portuguese Security and Secret Service agency founded in 1984.

The function of SIS is to guarantee the internal security and prevent cyber attacks, sabotage, terrorism, espionage and the practice of acts which, by their nature, can change or destroy the Rule of Law as constitutionally established.