Businesses    considering accepting Bitcoins or other forms of cryptocurrency    should be prepared to battle a rising number of malware aimed    at emptying digital wallets.  
    Thats the    takeaway from a new study by SecureWorks, computer maker Dells    security unit. Researchers found that the number of malware    targeted at stealing cryptocurrency from Windows PCs increased    along with the rise in value of Bitcoin since the beginning of    2013.  
    As of January of    this year, SecureWorks had identified on the Internet 100    unique families of malware capable of stealing wallet files or    digital currency from users exchange accounts. The increase in    the number of cryptocurrency-stealing malware made it one of    the fastest-growing categories of malware, the study    said.  
    While Bitcoin is        not the only type of cryptocurrency, it is the most popular    and the most valuable. The price has ranged from     a high of roughly $1150 in early December to a low of $420    on February 25. Bitcoins price on Thursday was about $565.    Other digital currencies include Namecoin, Litecoin, Dogecoin,    PPCoin, and Mastercoin.  
    The recent        shutdown of Mt. Gox, which once had the largest market    share of all digital currency exchanges, highlights the risk of    cryptocurrency traded over the Internet. The Bitcoin exchange    closed this month after cybercriminals stole $400 million. The    heist is under investigation by U.S. federal    authorities.  
    The rising    popularity of digital currency has led to its adoption by    retailers.     Overstock.com became the first major online retailer to    accept Bitcoins, and industry observers expect others to    follow. The site SpendBitcoins lists many places on the web    where people can spend their digital currency.  
    To protect the    digital wallets used in conducting transactions, SecureWorks    researchers recommend the use of a split wallet, which has a    portion of the file on the computer connected to the Internet    and the rest on a system with no network connection.  
    The file kept on    the Internet-enabled system would let the business track its    running balance and perform transactions with customers. On the    offline system is the private key for authorizing a transaction    before it is transmitted.  
    Electrum is an    example of a split wallet done through software. Examples of    hardware-based products include Hardware Wallet and Trezor,    which plans to release its product soon.  
    By using the    proper security, businesses can significantly reduce the risk    of accepting digital currency, Pat Litke, security researcher    for Dell SecureWorks Counter Threat Unit, said.  
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Still got Bitcoin? Protect it from malware, experts warn