The US Securities and Exchange Commission left its computers open to hackers by failing to encrypt sensitive information that had been supplied by stock exchanges, Reuters reported, citing sources. It is not yet known which stock exchange data could have been accessed on the computers affected. But embarrassingly, the lapse occurred in the regulator’s trading and markets division, which is responsible for “making sure exchanges follow certain guidelines to protect the markets from potential cyber threats,” Reuters said. There is no evidence of actual hacking, though, Reuters’ sources said.