Secure Short URL Generation Method that Recognizes Risk of Target URL

All the information and data on the Internet are connected based on URL. Although many people use URL to share and convey the information, it is difficult to transmit the information when URL is long and special characters are mixed. Short URL service is a service that transforms long URL with information into short form of URL and conveys the information, which makes it possible to access the page with necessary information. Recently, attackers who want to distribute the malicious code abuse the short URL through SMS or SNS to distribute malicious codes. With the short URL information, as it is difficult to predict the original URL, it has the vulnerability to Phishing attacks. In this study, a method is proposed, which writes the destination information when generating a short URL so that a user is able to check whether the destination is a web document or a file. The service provider of short URL monitors the risk of target URL page of the generated short URL and decides whether to provide service. By monitoring the modification of web-document, it measures and evaluates the risk of the webpage and decides whether to block the short URL according to the threshold, which prevents attacks such as “drive by download” through the short URL.