HTTP Cookie Covert Channel Detection Based on Session Flow Interaction Features

Algorithm 2

Adjacent cookie similarity in a session flow algorithm.

	Input: Cookie content sequence {cookie1, cookie2, ..., cookien}
	Output: Adjacent cookie similarity in a session flow
	if n < 2 then
	return −1
	end if
	for i = 1 to n − 1 do
	Similarityi ← ||CaculateSimilarity (cookiei, cookiei + 1)||
	end for
	sum ← 0
	for i = 1 to n − 1 do
	sum ← sum + Similarityi
	end for
	return sum/(n − 1)