The soaring value of bitcoin and other cryptocurrencies has hackers mobilizing, according to Data Breach Today.

Distributed denial-of-service attacks against bitcoin exchanges are up, and hackers have compromised software tied to “bitcoin gold,” the publication reports. While it’s not surprising, given bitcoin’s meteoric rise in value, the increased activity is raising questions about the security of cryptocurrency infrastructure.

“Not to perpetrate fear, uncertainty and doubt, but I was told by people I really respect in threat intelligence that there are at least four very advanced threat actor groups who have been attacking banks in recent years, and about a month ago, they just dropped their activities and moved over to bitcoin hacking,” Avivah Litan, vice president and distinguished analyst at Gartner Research told Data Breach Today executive editor Matthew J. Schwartz.

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