Last year, some of US President Barack Obama's messages were found in the hands of Russians hackers during the duration of infringementof the White House systems.
Although the hackers were able to dig very deep into the unclassified system, the classified networks of the White House were not in danger, the New York Times reports. The servers that controln the traffic on his BlackBerry Barack Obama they were also safe.
According to officials involved in the survey, the hack has greatly affected a number of people through the White House with unclassified e-mail and communications files, as reported by the Times. Barack Obama's personal e-mail account was not at risk, but a large part of his correspondence leaked from the accounts of people he often contacted.
The White House receives a lot of cyber attacks every day, the Times says, but the attack was unprecedented and highly targeted.
"It was one of the most sophisticated attacks we have ever seen," a senior official told the Times.
Earlier this week, the Pentagon revealed that Russia also violated its own unclassified networks this year, but the White House did not give details of any similarities between the two attacks.
Many high-level employees at the White House have two computers: one works in a secure, sorted network, and the other in unclassified networks, according to the Times.
However, it is likely that sensitive information, with policy issues found in unclassified networks.
Senior officials have been aware of the seriousness of the violation for months but have revealed it to the public this week. No details have been made of how many emails the hackers have received, or how many sensitive information they have.
