A few days ago a severe vulnerability in the Android implementation of the Java SecureRandom random number generator was discovered.The result of this vulnerability is that private keys used in transactions on Android devices can be determined.All bitcoins in addresses used on Android devices need to be immediately rotated to a new address.Bitcoin uses public/private key cryptography to sign bitcoin transactions.The security of the system relies on each address having it’s own private key that is only known by the owner of the address.If a malicious party were to gain control of the private keys associated with an address they would be able to spend any bitcoins that were sent to it.SecureRandom is a Java class that generates cryptographically strong random numbers.In order to remain secure the random numbers used to generate private keys must be nondeterministic, meaning that the output of the generator cannot be predicted.Mike Hearn stated in an email to bitcoin developers regarding the Secure Random class on android, “Android phones/tablets are weak and some signatures have been observed to have colliding R values, allowing the private key to be solved and money to be stolen.” Bitcoin uses a random number in transaction signatures and if the same random number is reused the private key of the wallet can be determined.

forums had noticed over 55 BTC were stolen a few hours after the client improperly signed a transaction using the compromised random number generator.luck in bitcoin miningUsers observed SecureRandom re-using the same random numbers for multiple transactions, thus compromising the private keys.bitcoin forum roThere are two types of mobile wallets, those where the private keys are generated locally on the phone, and those where private keys are held by a private company.bitcoin entrepreneur under house arrestAndroid wallet apps where keys are generated on the device include: Bitcoin Wallet, BitcoinSpinner, Mycellium Wallet, and Blockchain.info.bitcoin denial of service

Blockchain.info has already repaired the vulnerability, Bitcoin Wallet has an update in beta testing, and fixes for BitcoinSpinner and Mycellium are currently in development.gh/s to bitcoin calculatorThe updated version of the Bitcoin Wallet that will be released today or tomorrow has stopped using the SecureRandom class and reads instead from /dev/urandom directly.bitcoin tazIt will automatically send user’s coins to more secure addresses. identified a three step process to secure existing addresses on all other apps: Transfer all existing bitcoins to the new address.Do not send any bitcoins from this address using an Android device until the updates are implemented Notify any users of your old address of the change, so that the compromised address does not receive any more bitcoins.From among the jungles and rice paddies of central Bali, Indonesia, a website popped up last week selling freshly roasted coffee beans from local producers.

Technology and travelers have made direct-from-source coffee popular for a while now, but this operation has a unique point: it will trade beans only for bitcoin.The business is The Roast Station Project and leading it is JB Allen, aka the 'Java Nomad'.It's not his first e-commerce foray.Allen became internationally mobile by "taking full advantage of the freedom the internet provides ... creating and marketing online educational courses, software and other B2B tools" on the more traditional market.Along the way he dabbled in e-currencies by paying employees in Second Life's Linden Dollars.Allen's lifestyle has hauled him through 20 countries, living in South Korea, Japan and New Zealand before finding himself in the town of Ubud.Bali's tourist scene is a mixture of Western travel cultures, and Ubud's industry caters more to eco-tourists and yoga instructors than the neon-drenched binge-seekers on the beaches further south.Allen is one of a growing number of laptop-powered entrepreneurs to make a home, or at least a string of temporary bases, in Southeast Asia.

In 2010s parlance, they're digital nomads, Lifestyle Businesspeople, Tropical MBAs or just location-independent CEOs.Whatever names they choose or reject, this class of adventurers follows a similar path to the hippy backpackers of the 1970s but with a decidedly more entrepreneurial bent.The Asian tropics provide as many cheap workspaces as beaches, an affordable IT-trained workforce, decent bandwidth and proximity to a large proportion of the world's manufacturing centers.Even for those not producing physical goods, the atmosphere and cost of living are magnetic enough.They also tend towards a libertarian worldview, tired of the borders and bureaucracies and, above all, local currencies they encounter on a regular basis."I've been a follower of digital currencies for years, including earlier gold backed digital currencies like e-gold and convertible game currencies such as the Linden Dollar," said Allen."In fact, years ago I'd hire writers from inside of Second Life to create website content for my clients.

I would interview, hire and pay the writers all from within the game with the in-game currency, and my real-world clients then paid me in 'real' money.I think this was the first proof to me that an all-digital currency was completely viable.""I began noticing references to bitcoin pop up on many of the free market/libertarian blogs and websites I follow about a year and a half ago.Soon after, I downloaded my first wallet and started 'playing' with the currency – this is back when it was trading around USD$8 for one BTC.I purchased some, locked them away in a wallet and then just kept up on the news, always keeping an eye open for a way I could make good use of their potential."Allen found the catalyst for that after arriving in Indonesia and becoming involved with the world of coffee.He saw how middlemen within the coffee trade ecosystem serve as a series of barriers that distance bean growers from their final consumers: coffee connoisseurs like home baristas, specialist roasters and cafes offering high quality, single-origin and estate coffees to their customers.

Loans to farmers by brokers and middlemen from large corporate buyers force them to sell massive quantities of product for a bargain basement price.With time pressures and prices so low, there is little incentive to produce a higher quality harvest.The end result is low-quality, unripe or even rotten beans finding their way into consumer packaging.Smaller buyers can always find farmers or co-ops willing to raise quality in a portion of their crops for a premium price, and work directly with them.The Roast Station Project sources its Kintamani Arabica beans from one such location.But as Allen says, "there is still a planet full of coffee growers and coffee fanatics who would benefit from fewer middlemen in the way."One thing bitcoin does quite handily is remove lots of middlemen."Bitcoin has opened the door to a whole new level of person to person exchange and individual freedom, which is one reason why I wanted to be involved," said Allen."I imagine a world where a large coffee farm or the head of a farming co-op can deal directly with both smaller end-buyers and even the larger multinationals on a much more level playing field if they could sell, trade and auction their coffee directly via bitcoin.

If they can accept a 'currency' that's used by buyers from many different countries – and then use or convert that currency in their own area – everyone benefits."Allen absorbed as much knowledge of the local coffee industry as possible: visiting local farms to learn about production, meeting dealers to learn about processing and pricing, and getting to know roasters and cafe owners to learn about flavor profiles and the retail side of the equation.He purchased his own small-batch gas roaster (a 1.2kg w600 designed in Indonesia) to begin roasting the different coffees he sourced direct from the farms.That's when his 'hobby' started to become a full-time passion."Word got out quick and many people began visiting and sampling my coffees, and I found myself roasting a lot for my neighbors here and also shipping a lot out as gifts to my friends and family all over the world.This wasn't done as a business though – so I haven't yet sold coffee for fiat currencies."Allen needed something more substantial to convince the locals of bitcoin's benefits, so the Roast Station Project exists now to prove a point.