Post on 09-May-2015
description
A Tale about Bitcoin Anonymity
ZeronightsDefcon Russia
PrivacyForensics
E-commerceAnti-fraud systems
History1982 David Chaum (1990 released DigiCash)
1998 Wei Dai (B-Money)
1998 Nick Szabo BitGold
2008 Satochi Nakamoto (2009 released Bitcoin)
Basics• Bitcoind
• Public and private keys
• Address
• Wallet
• Coin
• Transaction
• Block
Concerns• Privacy – nobody knows what you are doing
• Anonymity – nobody know who are you
• Stealing of bitcoins
• Unfair mining
• Malware
• Fraud
Block Chain
Block Chain
Client• IP broadcasting with transaction
• Web services track users
• Government unlimited power
Balance• Virtual currency becomes offline money
• Initial deposit have to be anonymous
• Unlimited amount of addresses
• Change
Laundry• Give one money, get another money
• Works with many transactions flow only
• Effective with small transactions
• Problem of trust
Alternatives• Dark Wallet
• Zerocoin
• Forks
Thanks!