A Byzantine failure is the loss of a system service due to a Byzantine fault in systems that requires ____________. What is required?
Answer(s): A
A Byzantine failure is the loss of a system service due to a Byzantine fault in systems that require consensus.
https://en.wikipedia.org/wiki/Byzantine_fault_tolerance
A ____________cipher basically means it is using a fixed key which replaces the message with a pseudorandom string of characters. It is basically the encryption of each letter one at a time.What is the cipher type?
Stream cipher basically means using a fixed key which replaces the message with a pseudorandom string of characters. It is basically the encryption of each letter one at a time.
https://blockgeeks.com/guides/cryptocurrencies-cryptography/
You currently using the Metamask Chrome plugin and you see a selection for Etherescan in the plugin. What is Etherscan used for?
A search engine that allows users to easily lookup, confirm and validate transactions that have taken place on the Ethereum Blockchain
https://etherscancom.freshdesk.com/support/solutions/articles/35000022140-what-is-etherscan-
What are two challenges with using a Proof of Work algorithm? (Select two.)
Answer(s): C,D
http://www.hl.co.uk/news/2018/2/16/a-brief-history-of-blockchain-technology-everyone-should-read
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