The Swiss Government PKI is the centrepiece of the federal trust services and is used whenever confidentiality must be specifically ensured.
The PKI keys are trusted because the PKI is designed and operated according to very specific rules. The focus is on compliance with these rules, which is why this is consistently checked by accredited bodies. The PKI is thus certified annually and the trustworthiness of the keys is documented.
The Swiss Government PKI is one of three certified Swiss providers that meet the stringent requirements of these certifications (ESigA, ETSI).
You can find an overview of Swiss Government PKI certifications here.
The Swiss Government PKI provides IT services to Swiss authorities and organisations affiliated to the Confederation. In addition to the Federal Administration, these include the cantons plus Liechtenstein, communes, police authorities and courts, for example.