Cybersecurity introductory (Q&A)

What are zero-day attacks and why are they a threat? It means there is a new virus, worm or vulnerability in the world that has just been discovered. More specifically, it means that an adversary or malicious hacker that writes virus or code that gets it out to computers and that the virus or worm can destroy or damage something valuable with it and that the good hackers and the world would not have enough time to catch up with them. It is a threat because even antivirus software won't be able to detect and quarantine the virus or worm or computer automatic updates. The phase before the company updates their antivirus software or to after the new virus or worm is released to the world makes users vulnerable, even the antivirus software or automatic updates can't protect the virus or worm on the computer. What type of cybersecurity threat is perhaps most uniquely, given the nature of it, a risk in a research project like SETI@Home, and how might that threat materialize? DDoS attacks. The attacker can create botnets and afterwards commands the botnets by giving the botnets the instructions to carry out in order to crash the server with massive amounts of malicious traffic. After having that incident, the server may give an error message service unavailable or too many requests due to the fact that the server is in denial of service.