According to Hold Security CEO, Alex Holden, the hackers stole more than 1 billion internet user names and passwords. Hold Security is a Milwaukee firm that uncovers online security breaches.
Holden says if they sell the information, more accounts could be violated.
"If it gets into another hands on this black market these people can use the credentials to get into any account that had been compromised. And because people reuse their passwords, in many cases these credentials may lead to other information including very private personal data."
According to Holden, hackers gathered credentials from more than 420,000 websites - but they did not get into any major e-mail providers.