Security of Computer Networks

Viruses and the Role of Responsibility. Computer viruses are members of a family of destructive programs that have existed in one form or another since the 1960s with such descriptive names as Trojan horses, time and logic bombs, and worms. All of these electronic creations present a real threat to librarians interconnected with potential sources of infection in the form of academic networks, commercial database services, and local bulletin boards.

Chapter 3 - The Internet and TCP/IP

Password-based authentication protocols are susceptible to various attacks. Recently, Sood, Sarje, and Singh proposed an inverse cookie-based virtual password authentication protocol. Their protocol is practical and easy to implement. They claim that their scheme is secure to against various attacks, include online dictionary attack, offline dictionary attack, eavesdropping attack, denial of service attack, phishing attack, pharming attack, man-in-the-middle attack, replay attack, leak of verifier attack, message modification or insertion attack, and brute force attack. However, we find that some weaknesses of Sood et al.’s scheme. In this article, we will show that Sood et al.’s scheme is vulnerable to the on-line guessing password attack and the denial of service attack.