Web Application Firewall Using Machine Learning and Features Engineering

Table 2

Extracted features of the proposed model.

Feature	Description
Input length	Number of characters in payload
Alphanumeric character ratio	The ratio of alphanumeric characters over input length
Special characters ratio	The ratio of nonalphanumeric characters over input length
Attack weight	Sum of five subfeatures (see Table 3):
	(i) URL weight
	(ii) Number of attack words in inputs
	(iii) Manipulate payload weight
	(iv) Alphanumeric character to special character ratio
	(v) Files weight