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?
Answer(s): A
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
Your customer is an enterprise that is focused on financial sectors.What type of blockchain would this customer likely want specified for their enterprise?
Answer(s): D
Sometimes referred to as “private” blockchains, you are required to have some sort of permission to access any or parts of that blockchain. There are a multitude of variants and hybrid permissioned/permissionless blockchains that exist.
https://medium.com/@dustindreifuerst/permissioned-vs-permissionless-blockchains-acb8661ee095
Which is the following is the metaphor that describes a logical dilemma that plagues many computer networks?
Answer(s): B
BFT is so-named because it represents a solution to the "Byzantine generals' problem," a logical dilemma that researchers Leslie Lamport, Robert Shostak and Marshall Pease described in an academic paper published in 1982
https://www.nasdaq.com/article/byzantine-fault-tolerance-the-key-for-blockchains-cm810058
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