Trends on Computer Security: Cryptography, User Authentication, Denial of Service and Intrusion Detection

The new generation of security threats has beenpromoted by digital currencies and real-time applications, whereall users develop new ways to communicate on the Internet.Security has evolved in the need of privacy and anonymity forall users and his portable devices. New technologies in everyfield prove that users need security features integrated into theircommunication applications, parallel systems for mobile devices,internet, and identity management. This review presents the keyconcepts of the main areas in computer security and how it hasevolved in the last years. This work focuses on cryptography,user authentication, denial of service attacks, intrusion detectionand firewalls

Black Widow Crawler for TOR network to search for criminal patterns

This work aims to develop the Black Widow crawler focused on the Tor network, which searches, analyzes, and indexes websites containing criminal patterns. Also, a comparison of the results of the Black Widow crawler with one of the best crawlers found during information gathering is carried out, to confirm the possibility of an improvement in the current crawlers of the Tor network. The experiments demonstrate that the current crawlers can be improved. Compared to the current crawler, the Black Widow crawler achieved a 240% improvement in the number of indexed secret services