A Denial-of-Service (DoS) attack is a malicious attempt to disrupt the normal functioning of a targeted server, service, or network by overwhelming it with a flood of traffic or sending it information that triggers a crash. The main goal of a DoS attack is to render the targeted resource unavailable to its intended users. There are several types of DoS attacks, including: 1. **Volume-based attacks**: These involve overwhelming the target with a massive volume of traffic.
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An attack on service availability by exhausting resources or preventing useful work. Requiring inexpensive unauthenticated messages to trigger expensive private-key operations creates an amplification opportunity.
