CONFidence 2015: How to Steal Bitcoins - Daniel Shearer, Nick Zeeb
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Speakers: Daniel Shearer, Nick Zeeb Language: English For everything that has value there are those that want to steal it. The continuing rise of bitcoin has seen a corresponding increase in creative individuals who want to acquire bitcoins without the trouble of buying or mining them. As with any complex system, there are many points that can be attacked. In this talk we show how bitcoin works and explain specific attacks that have been carried out from social engineering to the exploitation of cryptographic primitives. CONFidence: http://confidence.org.pl/pl/
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CONFidence 2015: How to Steal Bitcoins - Daniel Shearer, Nick Zeeb
- 45. Alice Bob 2.1 1.0 Alice Bob 2 1 I send 1 coin to Alice Bob I send 1 coin to Bob Alice I send 1 coin to Alice Bob I send 1 coin to Bob Alice I send 1 coin to Alice Bob I send 1 coin to Bob Alice I send 1 coin to Alice Bob I send 1 coin to Bob Alice I send 1 coin to Alice Bob I send 1 coin to Bob Alice I send 1 coin to Alice Bob I send 1 coin to Bob Alice
- 46. Alice Bob 2.1 1.0 Alice Bob 2 1 I send 1 coin to Alice Bob I send 1 coin to Bob Alice I send 1 coin to Alice Bob I send 1 coin to Bob Alice I send 25 coins to me Myself I send 1 coin to Alice Bob I send 1 coin to Bob Alice I send 1 coin to Alice Bob I send 1 coin to Alice Bob I send 1 coin to Bob Alice I send 1 coin to Alice Bob 1+ 8302 934902843093572
- 47. X
- 48. I send 1 coin to Alice Bob
- 49. Cat Alice Bob 1 0 Cat 0 Alice Bob I send 1 coin to Bob Alice I send 1 coin to Cat Alice Alice Bob 0 1 Cat 0 Alice Bob 1 0 Cat 0 Alice Bob 0 0 Cat 1
- 50. I send 1 coin to Bob Alice
- 52. Transaction Malleability For every ECDSA signature (R,S), the signature (R, -S mod N) is a valid signature of the same message.
- 53. Alice I send 1 coin to Bob Alice I send 1 coin to Bob -Alice
- 58. I send 1 coin to Bob Alice
- 59. We send 1 coin to Bob Alice, Cat
- 63. ● Trick people into sending them to you ● Malware ● Cross Site Scripting ● Bad Randomness ● Watch TV ● 51% Attack ● Double Spending ● Transaction Malleability How to Steal Bitcoins…
- 65. More Links Block Chain ● https://blockchain.info/ ● https://blockchain.info/charts ECDSA ● http://rdist.root.org/2010/11/19/dsa-requirements-for-random-k-value/ ● http://www.nilsschneider.net/2013/01/28/recovering-bitcoin-private-keys.html TOR Attack ● http://arxiv.org/abs/1410.6079 TLS Certificate Revocation ● https://github.com/ChristopherA/revocable-self-signed-tls-certificates-hack