The main objective of this work is to develop and evaluate the performance of a new PK technique, which can avert all types of port attacks and meets all network security requirements. The new technique utilizes three wellknown concepts, these are: port-knocking (PK), steganography, and mutual authentication, therefore, it is referred to as the hybrid port-knocking (HPK) technique. It can be us...

the sturge-weber syndrome or encephalotrigeminal angiomatosis is a rare neurological and congenital disorder with a frequency of 1 in 50,000 births. this syndrome is a nonhereditary developmental condition and is characterized by the presence of congenital capillary malformation and a hamartomatous vascular proliferation involving the face (port-wine stain or facial birthmark), sometimes skull ...