16. The system of claim 15 , wherein the statistical analyzer is further configured to form a first server feature matrix of the first server using the plurality of features as row vectors of the first server feature matrix, and wherein the signature generator is further configured to determine the longest common subsequence among the first plurality of features by applying the sliding window to the row vectors of the first server feature matrix.
15. The system of claim 13 , wherein the signature generator is configured to determine the first packet content signature based on a longest common subsequence among the first plurality of features obtained by applying a sliding window to the first plurality of features.