It seems that people typically prefer dying later to earlier. also do not having been created earlier later. Lucretius’ Puzzle is the question whether anything rationally recommends a preference for over In this paper, I distinguish among three ways in which can be understood and say how think they ought answered.

As Distributed Denial-of-Service attacks become more prevalent and sophisticated, a promising new mechanism designed to defeat these attacks is client puzzles. Client puzzles force a computational load on clients before their traffic is forwarded thereby slowing the rate at which a client can inject traffic into the network. Chained puzzles are a type of IP-layer puzzle that require a series of...

Cryptographic puzzles provide an elegant solution in combating denial of services attacks. In this paper we introduce the concept of chained puzzles and we define two kinds of chained puzzles: linearly chained puzzles and randomly chained puzzles. These construnstions prove to be very useful in some scenarios, from which the more general is in which a client may choose to solve only some of the...

We propose a knowledge-lean method to generate word puzzles from unstructured and unannotated document collections. The presented method is capable of generating three types of puzzles: odd one out, choose the related word, and separate the topics. The difficulty of the puzzles can be adjusted. The algorithm is based on topic models, semantic similarity, and network capacity. Puzzles of two dif...