The concept of underdetermined recursive leastsquares (URLS) adaptive filtering is introduced. In particular, the URLS algorithm is derived and shown to be a direct consequence of the principle of minimal disturbance. By exploiting the Hankel structure of the filter input matrix, the fast transversal filter (FTF) version of the URLS algorithm (URLS-FTF) is derived including sliding window and g...

The prevalence of spam URLs in Internet services, such as email, social networks, blogs and online forums has become a serious problem. These spam URLs host spam advertisements, phishing attempts, and malwares, which are harmful for normal users. Existing URL blacklist approaches offer limited protection. Although recent machine learning based URL classification approaches demonstrate good accu...

The proliferation of maliciously coded documents as file transfers increase has led to a rise in sophisticated attacks. Portable Document Format (PDF) files have emerged major attack vector for malware due their adaptability and wide usage. Detecting PDF is challenging its ability include various harmful elements such embedded scripts, exploits, malicious URLs. This paper presents comparative a...

Greek URLs reveals that it can be fruitfully exploited towards automatic keyword identification within Greek URLs.

This report presents a study of URL and content persistence among 51 million pages from a national web harvested 8 times over almost 3 years. This study differs from previous ones because it describes the evolution of a large set of web pages for several years, studying in depth the characteristics of persistent data. We found that the persistence of URLs and contents follows a logarithmic dist...

Web browser bookmarks (also known as “favorites”) predominate as the current approach to managing URLs. Yet these bookmarking schemes exhibit deficiencies that hinder effective organization and access to URLs. This paper describes WebCord, a visualizing tool for enhancing Web-based learning that allows the user to organizing and managing their URLs of interest by creating categories.