"Tor Turns to Proof-Of-Work Puzzles to Defend Onion Network From DDoS Attacks"

The Onion Router (Tor) faced a massive Distributed Denial-of-Service (DDoS) attack. DoS abuse continues to be a persistent problem, degrading the performance of the anti-censorship service and causing many to be concerned for its security. Tor's onion routing is a privacy technology dating back 20 years. It essentially works by relaying a user's Internet traffic through a shifting maze of nodes so that, with some clever encryption encapsulation, a network eavesdropper, for example, will struggle or be unable to determine a user's true public IP address. To prevent future crippling DDoS attacks, Tor developers have been working on a defense initially proposed in April 2020. It was introduced in Tor version 0.4.8.4 and relies on a mechanism developed by Moni Naor and Cynthia Dwork in 1992 as a defense against DoS and spam. This article continues to discuss Tor turning to proof-of-work puzzles in the fight against DDoS attacks. 

The Register reports "Tor Turns to Proof-Of-Work Puzzles to Defend Onion Network From DDoS Attacks"