Home » Author Archives: Tamer Sameeh

Author Archives: Tamer Sameeh

Identity Based Onion Routing – A Secure and Efficient New Scheme for Tor

The onion routing internet protocol promotes anonymous networking on various forms of public networks. Today, there are several onion routing schemes, such as Tor, to deploy the anonymous networking protocol across public networks. Despite the fact that the multi-pass schemes for the construction of the cryptographic circuit are somehow satisfactory, their circuit construction algorithms exhibit some drawbacks when it comes ... Read More »

Botnets for Discovering and Monitoring Terrorism Related Content on the Dark Web

The recent global epidemic of terrorist attacks has revealed how terrorists are not only utilizing the surface web, but also the dark web for building and establishing their networks. To counteract this, Law Enforcement Agencies (LEAs) need efficient and effective means for detection and monitoring of terrorism related content on the internet, in order to prevent the occurrence of terrorist ... Read More »

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Identity Based Onion Routing – A Secure and Efficient New Scheme for Tor

The onion routing internet protocol promotes anonymous networking on various forms of public networks. Today, the are several onion routing schemes, such as Tor, to deploy the anonymous networking protocol across public networks. Despite the fact that the multi-pass schemes for the construction of the cryptographic circuit are somehow satisfactory, their circuit construction algorithms exhibit some drawbacks when it comes ... Read More »

A Novel System for Secure Offline Bitcoin Payments

Bitcoin is inarguably the most successful cryptocurrency so far, when market capital and growing popularization are considered. Users have to have online access to be able to initiate transactions to spend their bitcoins. A certain amount of time is required for the transaction to be successfully confirmed and validated (20-30 minutes in most cases). However, a large number of real ... Read More »

Classification of Illegal Activities On the Tor Network

If we envision the internet as an ocean, the Surface Web represents no more than the superficial waves flowing on top. The deep web, on the other hand, represents information that is deeply sunken and cannot be accessed by conventional search engines. The Deep Web contains a number of Darknets, that cannot also be indexed by conventional search engines, and ... Read More »

Examining the Bitcoin Address Graph

Bitcoin is by far the most popular unregulated, decentralized cryptocurrency. Since the genesis block was mined, the number of bitcoin users has been rising at a rather exponential rate. While bitcoin’s public ledger offers high levels of transparency, it does not directly reveal the real-world identity of either the senders or receivers of bitcoin transactions. A single bitcoin transaction is ... Read More »

Tutorial – Altcoin Flipping : Making Money Online Via Trading Cryptocurrencies

The year of 2017 is definitely the year of crypto, especially that the market capital of cryptocurrencies has reached its all time high during the past week, recording around $28.7 billion according to data from coinmarketcap.com. Many cryptocurrency traders, or more precisely “altcoin flippers”, as myself have made some good profits during the past few weeks. I managed to double ... Read More »

The Blockchain Technology Is On the Agenda of the Upcoming G20 Summit

It seems that bitcoin, and the blockchain technology in general, will be one of the priorities on next the Group of Twenty (G20) summit’s agenda, which is expected to be held in Hamburg, Germany next July. Along the communiqué, which outlined the priorities of the upcoming G20 summit, the Presidency of the summit stated that the popularization of digital technologies ... Read More »

TrueBit and Golem – The Future of Computation Outsourcing

Every public consensus based cryptocurrency available today, such as bitcoin and ethereum, offers a blockchain, or a definitive public ledger which is comprised of financial transactions. This consensus based algorithm enables bitcoin transactions from one user to the other, while transactions of ethereum’s blockchain combine financial transactions with database operations which rely on the execution of more complex pieces of ... Read More »

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Hybrid Consensus and Fair Proof-of-Work (fPoW)

Bitcoin’s proof-of-work (PoW) distributed consensus has attracted the attention of bitcoin enthusiasts and those who are interested in the blockchain technology in general. Apart from its brilliant decentralization property, it has a critical limitation when efficiency is considered, as transactions cannot be confirmed in a matter of seconds. During 2016, the hybrid consensus approach was proposed to address this issue, ... Read More »

Purity and Prices of Drugs Purchased Online Versus Offline in the Netherlands

Throughout the past decade, the sourcing, marketing and trading of illicit drugs on the world wide web have grown at a rapid rate. The perception of high quality of products is the main catalyst driving customers to online drug marketplaces, especially those on the deep web, however, there is very little evidence supporting this assumption. Moreover, the perception of better ... Read More »

Imperfectly Programmed Smart Contracts Will Gobble Your Money

Ethereum is by far one of the most popular cryptocurrencies, as more than 10 million transactions have already taken place on Ethereum’s blockchain, since the cryptocurrency was first launched in 2015. Ethereum’s blockchain is considered the most popular smart contract platform today. On Ethereum’s blockchain, a smart contract can be coded using a myriad of programming languages including Solidity (best ... Read More »