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How can a distributed network of computer nodes agree on a decision, if some of the nodes are likely to fail or to act dishonestly? This is the fundamental question of the so-called Byzantine Generals’ problem, which gave birth to the concept of Byzantine fault tolerance.
Free public WiFi is now available in many places. Airports, hotels, and coffee shops all promote free internet connection as an added benefit of using their services. For many people, being able to connect to a free internet on the go seems ideal. This would be particularly useful for the traveling business person, now able to access their work emails or share documents online. However, there are more risks to using public WiFi hotspots than many internet users might have realized, and most of those risks are related to Man in the Middle attacks.
The Delegated Proof of Stake (DPoS) consensus algorithm is considered by many as a more efficient and democratic version of the preceding PoS mechanism.
The Lightning Network (LN) as a concept was created by Joseph Poon and Thaddeus Dryja in 2015. The main idea behind the project is to design a payment protocol that can be used as an off-chain solution for the scalability problem faced by the Bitcoin blockchain, but the concept may be applied to other Cryptocurrencies as well.