GCHQ: A cyber-what-now? Rumours of our probe into London Stock Exchange 'cyberattack' have been greatly exaggerated

GCHQ: A cyber-what-now? Rumours of our probe into London Stock Exchange 'cyberattack' have been greatly exaggerated

Despite 'people familiar with matter' claiming otherwise to US news


GCHQ and its cyber-defence offshoot NCSC have both denied that they are investigating a cyber-attack on the London Stock Exchange, contrary to reports.


The Wall Street Journal, normally a reliable source for news with a financial flavour, reported that British signals intelligence agency Government Communications Headquarters (GCHQ) has been looking into an August 2019 outage of the LSE, which was reported to the Financial Conduct Authority at the time.


"The incident," the newspaper claimed, "which delayed the market open by more than an hour and a half and was the worst outage in eight years, immediately triggered government cyber alert systems, according to the people familiar with the matter."


It added that GCHQ was "examining if the software code ..

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