Bitcoin - Revision history

Leo: Recategorize

2019-09-01T01:50:08Z

Recategorize

2019-05-20T00:36:29Z

2017-06-03T23:46:41Z

← Older revision		Revision as of 23:46, 3 June 2017
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	My Bitcoin Address is: 1FFVMcZt1TzXPY8YKrzb4HQ8BJomRrMYYK		My Bitcoin Address is: 1FFVMcZt1TzXPY8YKrzb4HQ8BJomRrMYYK

			Resources:
			* https://programmingblockchain.gitbooks.io


	== Overview ==		== Overview ==

2017-03-17T03:43:52Z

@@ Line 3: / Line 3: @@
 This article covers some specific aspects of the Bitcoin protocol.
-My Bitcoin Address is: 1HDp1gU3rgrRNKqrKorz8uWCpHUNdyGqXm
+My Bitcoin Address is: 1FFVMcZt1TzXPY8YKrzb4HQ8BJomRrMYYK
 == Overview ==
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 For detailed information, read the Bitcoin paper or one of the many sites out there.
 == Hashes & Encoding ==
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 * https://keybase.io/warp/warp_1.0.6_SHA256_e68d4587b0e2ec34a7b554fbd1ed2d0fedfaeacf3e47fbb6c5403e252348cbfc.html
 [[Category:CryptoCurrency]]

2015-09-24T07:54:31Z

Brain Wallets

← Older revision		Revision as of 07:54, 24 September 2015
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	# or cat password.txt \| brainflayer -b hashes.blf		# or cat password.txt \| brainflayer -b hashes.blf
	# or john --incremental --stdout \| brainflayer -b hashes.blf		# or john --incremental --stdout \| brainflayer -b hashes.blf

			==== Key Stretching ====
			To make brain wallets stronger, the key generation can be made to be more expensive and thereby limiting the number of tries an attacker can made per second.

			* https://keybase.io/warp/warp_1.0.6_SHA256_e68d4587b0e2ec34a7b554fbd1ed2d0fedfaeacf3e47fbb6c5403e252348cbfc.html


	[[Category:CryptoCurrency]]		[[Category:CryptoCurrency]]

2015-09-24T05:15:26Z

Address / Keys

← Older revision		Revision as of 05:15, 24 September 2015
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	== Address / Keys ==		== Address / Keys ==
	A Bitcoin address is a 160-bit hash of ~~theh~~ ECDSA public/private keypair.		A Bitcoin address is a 160-bit hash of the ECDSA public/private keypair.

	=== Generating An Address ===		=== Generating An Address ===
	# Take a 160-bit value as the private key.		# Take a random 160-bit value as the private key.
	# Generate a public key with it		# Generate a public key with it
	# Hash = SHA256(PublicKey)		# Hash = SHA256(PublicKey)
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	# brainflayer -b hashes.blf -i phraselist.txt		# brainflayer -b hashes.blf -i phraselist.txt
	# or cat password.txt \| brainflayer -b hashes.blf		# or cat password.txt \| brainflayer -b hashes.blf
			# or john --incremental --stdout \| brainflayer -b hashes.blf

	[[Category:CryptoCurrency]]		[[Category:CryptoCurrency]]

2015-09-23T07:52:10Z

brainflayer link

← Older revision		Revision as of 07:52, 23 September 2015
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	==== Attack ====		==== Attack ====
	Ryan Castellucci did a talk on Defcon 23 on cracking brain wallets using his program called Brainflayer.		Ryan Castellucci did a talk on Defcon 23 on cracking brain wallets using his program called Brainflayer, available at https://github.com/ryancdotorg/brainflayer.

	The basic idea is to extract all unique addresses in the bitcoin system. Dump the addresses into a bloom filter for almost constant time search, then use Brainflayer to bruteforce check on a word list that matches a specific address hash.		The basic idea is to extract all unique addresses in the bitcoin system. Dump the addresses into a bloom filter for almost constant time search, then use Brainflayer to bruteforce check on a word list that matches a specific address hash.

2015-09-23T06:46:17Z

Attack

← Older revision		Revision as of 06:46, 23 September 2015
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	Ryan Castellucci did a talk on Defcon 23 on cracking brain wallets using his program called Brainflayer.		Ryan Castellucci did a talk on Defcon 23 on cracking brain wallets using his program called Brainflayer.

	The basic idea is to extract all unique addresses in the bitcoin system. ~~Use~~ the ~~program to determine all matching~~ addresses ~~using~~ a ~~wordlist~~, ~~thus giving~~ a ~~subset of all addresses~~ that ~~can be controlled~~.		The basic idea is to extract all unique addresses in the bitcoin system. Dump the addresses into a bloom filter for almost constant time search, then use Brainflayer to bruteforce check on a word list that matches a specific address hash.


			That is:
			# get all Bitcoin Addresses as Hash160 > hashes.hex
			# hex2blf hashes.hex hashes.blf
			# brainflayer -b hashes.blf -i phraselist.txt
			# or cat password.txt \| brainflayer -b hashes.blf

	[[Category:CryptoCurrency]]		[[Category:CryptoCurrency]]

2015-09-23T06:40:29Z

Brain Wallets

← Older revision		Revision as of 06:40, 23 September 2015
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	The publickey can either be uncompressed or compressed. A compressed public key is simply a truncated key where the missing parts can be recomputed.		The publickey can either be uncompressed or compressed. A compressed public key is simply a truncated key where the missing parts can be recomputed.

			==== Attack ====
			Ryan Castellucci did a talk on Defcon 23 on cracking brain wallets using his program called Brainflayer.

			The basic idea is to extract all unique addresses in the bitcoin system. Use the program to determine all matching addresses using a wordlist, thus giving a subset of all addresses that can be controlled.



	[[Category:CryptoCurrency]]		[[Category:CryptoCurrency]]

2015-09-23T06:32:39Z

Hashes & Encoding

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 == Hashes & Encoding ==
 === Hash160 (Transactions) ===
 Transaction numbers are represented using Hash160 of the public key. That is: