Storage of incoming messages Client application O In addition to the core application the Eucaris II client application can be used by a State. When applicable, the core and client application are modified under auspices of the Eucaris organisation. Security concept M The concept is based on XML-signing by means of client certificates and SSL-encryption by means of service certificates. Message specifications M Every State has to comply with the message specifications as set by the Eucaris organisation and this Chapter. The specifications can only be changed by the Eucaris organisation in consultation with the States. Operation and Support M