BLOC 514 REVISION QUIZ - Emerging Topics In Blockchain & Digital Currency

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Flood Attack, what does it mean & is a flood attack possible?
• sending thousands of nano transactions to one's self or others • filling blocks to max size • Expensive to sustain due to transaction fees
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what does a 51% attack mean & what are the benefits & pitfalls?
• An attack by holding a majority Attacker can : • Reverse their own transactions & double
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what is the lowest possible % required to carry out a 51% attack?
33% @ lowest
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What is a DoS attack?
(Distributed) Denial of Service - an attack by overwhelming the service with requests beyond capacity, a node would be unable to process transactions or receive new ones
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What countermeasures for Bitcoin prevent a DoS attack?
• Limit block size / Signature Checks / Script Size / Multi-Sig Keys / Stack Elements & size of values pushed • Penalize / Disconnect / Ban peers sending duplicate / expired / invalid signature messages
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what can a Node do to prevent a DoS
DON'T store or forward
• orphan transactions/ blocks (past 10,000 )
• double spend transactions
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What is an Eclipse Attack, how is it done, how can it be used and what solutions can be used to prevent it?
• Node Takeover -isolating & monopolize a nodes incoming/outgoing connections
• manipulating their view of the blockchain • REQUIREMENTS: lots o
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Selfish Mining, how does it work, what does it do?
• holds back blocks for personal gain • confirmations are done privately • large miners increase returns by not publishing completed blo
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What is meant by time jacking in Bitcoin?
• taking advantage of discrepancies in global time to allow double spend of attackers coins • announcing incorrect timestamps can deceive to accept an alternative bl
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What is a dusting attack? how can it be used by corporations? how can we prevent it?
• tracks users for phishing extortion advertisement • sends micro amounts of crypto (dust) & tracks Unspent Transaction Output (UTXO)
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Explain briefly what Zerocoin is, how it functions & what problem it was designed to solve?
• an extension of bitcoin that supports anonymity • decentralised • provably secure cryptography used to hide the amount & or
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How does Delegated Proof of Stake(DPoS) work?
• Representational system with real-time voting •
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Other cards in this set

Card 2

Front

what does a 51% attack mean & what are the benefits & pitfalls?

Back

• An attack by holding a majority Attacker can : • Reverse their own transactions & double

Card 3

Front

what is the lowest possible % required to carry out a 51% attack?

Back

Preview of the front of card 3

Card 4

Front

What is a DoS attack?

Back

Preview of the front of card 4

Card 5

Front

What countermeasures for Bitcoin prevent a DoS attack?

Back

Preview of the front of card 5
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