hypnosec writes: An attacker managed to access an unencrypted backup of wallet keys and steal 24,000 BTC equaling more than a quarter of a million USD following which Bitcoin exchange Bitfloor has been shutdown while the investigation of theft is going on. The attack was carried out sometime last night because of which Roman Shtylman – founder of Bitfloor suspended operations of the exchange. While we are writing this, the exchange rate of 1BTC is $10.40 US, taking the total value of the heist to $250,800 US. You can check the current rates through Preev. In a forum post, Shtylman has urged Bitcoin users that BitFloor needs their help.