Mengenal Bitcoin dan Cryptocurrency - Kriptologi€¦ · Internet E-Commerce Smartphone Apps 7....
Transcript of Mengenal Bitcoin dan Cryptocurrency - Kriptologi€¦ · Internet E-Commerce Smartphone Apps 7....
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E-Money vs Cryptocurrency
Dimaz Ankaa Wijaya
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▸Education▹UGM – B. Computer Science (2007)
▹MONASH Uni.– M. Networks & Security (2016)▹MONASH Uni. – Ph.D Student (2017-current)
▸Field of Expertise▹Dig. forensic, cybersecurity▹Cryptocurrency, Blockchain
▸Work Experience▹Indonesian Government official (2009-2017)
Dimaz Ankaa Wijaya
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Today’s Menu
▸Money▸E-Money▸Cryptocurrency▸E-Money vs Cryptocurrency ▸Cryptocurrency in Depth
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MONEY
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Functions of Money (Mankiw, 2014)
▸Medium of exchange (to buy stuff)▸Unit of account (to measure prices and values)
▸Store of value (to transfer purchasing power to the future)
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Evolution of Money
▸Simple form (salt, shells, etc)▸Precious metals (gold, silver)▸Paper money and coins (fiat money)▸Digital currency▹Electronic money (electronic fiat money)▹Cryptocurrency?
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Challenges With Physical Money
▸International Trade▸Internet▸E-Commerce▸Smartphone Apps
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E-Money
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Electronic Money / e-Money
▸Fiat money in digital form▸Issued by bank/financial institution▹Hardware-based: credit card▹Software-based: e-Cash, Go-Pay
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Why e-Money Has Value
▸E-Money reflects your fiat currency▸Convenience: no physical money needed▸Highly regulated▸Financial technology▸Fits the function of money
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International Trade System: e-Money Needed11
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Attacks on e-Money12
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Cryptocurrency
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Various Types of Cryptocurrency14
Source: bitslog
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Overview of Bitcoin
▸Created by “Satoshi Nakamoto”▹A Peer-to-Peer Electronic Cash System (Nakamoto, 2008)
▸Limited supply▸“Low” transaction fee▸ID theft protection▸“Fast” settlement
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What’s Special About Bitcoin
▸Blockchain (public ledger)▸No central authority▹Double spending▹Peer-to-Peer network
▸No middleman▸Customized transaction
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Blockchain: Identical Ledgers Across Nodes17
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How Blockchain Works18
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Double Spending Problem19
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Peer-to-Peer Network
▸Identical information in each server/node.
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No Central Authority: Byzantine Generals Problem/BGP21
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Proof of Work / PoW
▸Solving BGP▸Required to construct a new block▸Find a hash value based on a criteria▸Mining
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Remove The Middleman23
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Customized Transaction
▸Escrow transaction▸Hash-locked transaction▸Time-locked transaction
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ComparisonsE-money vs Cryptocurrency
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E-Money vs Cryptocurrency26
No Characteristics E-Money Cryptocurrency
5 Authentication Method ID card, password, PIN Digital signature
1 Medium Digital Digital
2 Transaction network Banks or Financial Institution Peer-to-peer
3 New money creation Government Miners
4 Validator Banks or Financial Institution Node and Miners
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E-Money vs Cryptocurrency (2)27
No Characteristics E-Money Cryptocurrency
9 Collateral asset Fiat money N/A
6 Money Supply Government Consensus
7 Backer Government N/A
8 Exchange rate Currency market & Government Currency market
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Summary: Centralized vs Decentralized28
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CryptocurrencySecurity IssuesAttacks and Mitigation Strategies
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Cryptocurrency Exchange Hacks30
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Private Keys Theft/Lost31
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51% Attack
▸Controlling the majority of the consensus.
▸Mitigation: ▹Discourage such event ▹Evaluate consensus method
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Denial of Service
▸Flooding nodes with invalid requests.▸Flooding network with dust transactions.
▸Mitigation: ▹Drop requests, filtering▹Prioritize transactions.
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Sybil Attack
▸Several malicious nodes providing wrong information.
▸Mitigation: ▹Whitelist of trusted nodes.
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Selfish Mining
▸Not broadcasting a new block.▸Keep mining based on the block.▸After a certain length, the blocks are published.▸Double spending potential.
▸Mitigation?
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Private Key Theft
▸Stealing private keys.
▸Mitigation: ▹Shamir secret sharing ▹Multisignature▹Security hardening
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Conclusion
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Comparing Benefits: E-Money vs Cryptocurrency38
No Criteria E-Money Cryptocurrency
1 Consumer Protection V X
2 Well Regulated V X
3 Stable Value V X
4 Fast Settlement X V
5 Infeasible to tamper the data X V
6 Transaction Fee X V
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Comparing Problems: E-Money vs Cryptocurrency39
No Criteria E-Money Cryptocurrency
1 Single Point of Failure V X
2 Consensus Problems X V
3 Privacy and Anonymity V V
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Attack Vectors: E-Money vs Cryptocurrency40
No Criteria E-Money Cryptocurrency
1 Software Security V V
2 Network Security V V
3 Dishonest Authority V X
4 ID Theft, Secret Key Theft V V
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NEXT: Government-issued Cryptocurrency?41
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Blockchain on Other Areas?42
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