A man from Merseyside faces jail after admitting to a distributed denial of service (DDoS) campaign against children's social services, social housing and crime prevention websites.
Ian Bootle, 51, carried out a series of DDoS attacks in 2013 targeting a range of businesses and public sector websites.
These included multinational banks, sites providing support for adoption, crime reporting sites and social housing organisations.
The websites were not hacked and no data appeared to be taken, however by flooding the web servers with data more than 300 websites were made inaccessible to users.
Sullivan was arrested in July 2013 in a joint operation by the National Crime Agency's National Cyber Crime Unit after analysis of Sullivan's computer found software designed to take websites offline, documentation linking him to other campaigns and activity carried out by the hacking collective Anonymous.
Sullivan is due to be sentenced at Liverpool Crown Court on 1st May 2015.
Steven Pye senior operations manager at the NCCU said: "Among other impacts, Sullivan's actions are likely to have deprived vulnerable people of access to important information, ranging from where to get support on family breakup, to reporting crime anonymously.
"This multi-agency operation illustrates the commitment of the NCA and its partners to pursuing people who think they can criminally disrupt important public services or legitimate businesses."
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