A vast debit card fraud scheme that allegedly netted $US45 million has been linked to the hacking of credit card processors in the US and India.

More than 50 million users of the daily deals site LivingSocial are being asked to reset their passwords after hackers attacked the company's servers and potentially made off with personal data.

Following similar initiatives by Apple, Google and Facebook, Microsoft is enabling two-factor authentication for its Microsoft Account service, the log-on service for many of its online and desktop products.

An online bitcoin storage service, Instawallet, said Wednesday it is accepting claims for stolen bitcoins after the company's database was fraudulently accessed.

A new piece of malware that infects point-of-sale (POS) systems has already been used to compromise thousands of payment cards belonging to customers of U.S. banks, according to researchers from Group-IB, a security and computer forensics company based in Russia.

The Internal Revenue Service today reminded taxpayers that there are plenty of scam artists and cybercriminals that want your money.

Several high-profile Xbox Live accounts for former and current Microsoft employees were compromised by attackers using social engineering techniques, the company said late Tuesday.

A website that leaked credit reports of celebrities and government officials last week appears to have a curious link to the malicious banking software known as "Zeus."

Last week Gen. David Petraeus, the director of the Central Intelligence Agency, resigned in response to what has turned out to be a much bigger scandal than it first appeared.