Hashcash

Known as: Hash cash

Hashcash is a proof-of-work system used to limit email spam and denial-of-service attacks, and more recently has become known for its use in bitcoin…

Papers overview

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2020

Client puzzles are computable cryptographic problems used to defend against connection depletion attacks [6]. These are…

2018

Cryptocurrencies such as Bitcoin rely on a proof-of-work system to validate transactions and prevent attacks or double-spending…

2015

This paper deals with a variant of block withholding attack. Here, we analyze the strategies of a selfish Bitcoin miner who in…

2014

Successful out-of-band authentication in popular languages such as PHP has proven to be problematic and in many ways unsafe as…

2014

Hashcash was originally proposed as a mechanism to throttle systematic abuse of un-metered internet resources such as email, and…

2007

This chapter investigates the problem of e-mail spam, and identifies methods to minimise the volumes. The analysis focuses on the…

2006

Abstract Spam can be defined as unsolicited e- mail, often of a commercial nature, sent indiscriminately to multiple mailing…

2005

This paper investigates the problem of e-mail spam and identifies methods to efficiently minimize the volumes. It is argued that…

2004

Ad-hoc networks are made up of one or more low power mobile wireless nodes. These nodes are able to communicate over a wide range…

2002

As the commercialisation of the Internet continues, unsolicited bulk email has reached epidemic proportions as more and more…