Using an Efficient Detection Method to Prevent Personal Data Leakage for Web-Based Smart City Platforms

Table 4

Classification of file name extensions for 50 websites.

File name extension	No. of total files	No. of files with personal data	Percentage of files with personal data	No. of repeated personal data	No. of repeated personal data per file	No. of nonrepeated personal data	Average nonrepeated personal data per file
	(A)	(B)	(C = B/A)	(D)	(E = D/B)	(F)	(G = F/B)
Word	3,381	2,546	75.30%	25,146	9.88	8,952	3.52
Excel	513	362	70.57%	12,852	35.50	3,772	10.42
PPT	87	66	75.86%	318	4.82	258	3.91
PDF	9,649	7,679	79.58%	201,083	26.19	37,488	4.88
HTML	64,264	51,264	79.77%	1,031,503	20.12	31,692	0.62
Total	77,894	61,917		1,270,902		82,162