This study aimed to achieve the following objectives:

• To anticipate the security needs and requirements of future space missions (Earth observation, communication, navigation, science, exploration, etc.) with respect to architectures considered for future missions.

• To build an advanced security architecture portfolio embedding state-of-the-art security concepts, technics, technologies, components and solutions.

• To identify main priority activities (research, engineering, evaluation, validation, etc.) to be run in order to complete and consolidate the preliminary portfolio and ensure efficient applicability in support of the definition of security architectures for future space missions.

The associated approach to fulfil the identified objectives was the following:

• Preliminary definition of system level architectures for future target space missions via dedicated realistic scenario (mono or combined missions).

• Identification of security issues / needs and, therefore, security objectives for such missions.

• Review of state-of-the-art candidate security concepts and technics with selection and detailed analysis of applicable security concepts and technics.

• Selection of applicable security technics for future space missions.

• Analysis of security objectives fulfilment by selected security technics.

• Elaboration of a detailed security architecture portfolio.

• Identification of future activities required to complete/consolidate a preliminary security architecture portfolio.