Quote from: Grand_Voyageur on August 13, 2015, 06:16:12 PM

New Cracking Tool Exposes Major Flaw in Bitcoin Brainwallets

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A white-hat hacker has released a new tool designed to illustrate the ease with which illicit actors can steal bitcoins from brainwallets, a type of bitcoin wallet iteration where passwords are not stored digitally but in the memory of the user.

Originally conceived as a way to keep sensitive wallet data offline and make bitcoin addresses easier to remember, the brainwallet was partly undone due to how it interacts with the bitcoin blockchain. A brainwallet uses a single, long password or phrase, converts it to a private key, a public key and finally an address. Using an offline attack, it's possible to rapidly guess potential passwords to see if they're correct.

New research by Ryan Castellucci, a security researcher at digital fraud firm White Ops, indicates there is as major flaw in this method. He highlights that the final bitcoin address is recorded in the blockchain as a password hash. When used for website authentication, password hashes help determine whether the word or phrase supplied is correct, meaning this data can be used as a reference to bad actors looking for the password.

Full story: http://www.coindesk.com/new-cracking-tool-exposes-major-flaw-in-bitcoin-brainwallets/

Кoгдa выpacтит бтк дo $20к ?