There are more than 15 billion stolen account credentials being sold or even shared for free on the dark web, with individual entries selling for an average of $15.43, a new research report states.

Roughly one-third of the credentials, or about 5 billion, are unique, according to Digital Shadows, whose researchers reached these totals following an analysis of two-and-a-half years of advertised account credentials found across nine active and defunct dark web marketplaces.

Of the various categories of stolen credentials, bank and financial account passwords were found to be the most expensive -- advertised on the dark web for an average of $70.91, with some prices set upwards of $500.

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