The invention discloses a multi-dimensional and multi-
granularity network space
security measurement method. The multi-dimensional and multi-
granularity network space
security measurement method comprises the following steps: dividing a network
system into three hierarchies according to logical hierarchy, wherein the three hierarchies are reliability security, environment security and
vulnerability security separately; extracting and selecting indexes in the network
system according to the three hierarchies, and establishing a network space
security index system by means of the system
engineering principle and the
analytic hierarchy process (AHP); performing dimensional division on each hierarchy based on the established network space
security index system; wherein the reliability securityis measured by a weak
connectivity dimension and a strong
connectivity dimension, the environment security is measured by a network asset and service dimension and an asset index change dimension, and the
vulnerability security is measured by a
vulnerability dimension and an
attack graph dimension; and adding the
granularity on the basis of the hierarchy and dimension, and obtaining the measurement values of each hierarchy and each dimension within the specified range of the granularity, wherein the sum is the network space
security measurement result. Using the multi-dimensional and multi-granularity network space security measurement method, the measurement results are more accurate and comprehensive.