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The body will deal with "cybersecurity incidents" of national significance.
It will also provide advice and alerts on cyber-threats to government, industry and academia.
Speaking at the launch, Cabinet Office Minister Francis Maude said that 93% of large corporations had had "a breach" over the past financial year.
The attacks cost on average between £450,000 and £850,000, he added.
The minister also repeated the claim that one London-based company had suffered a security breach which cost it "£800m worth of revenue".
But, he said, cybersecurity also presented an opportunity. It was "an essential feature of - and a massive opportunity for - the UK's economic recovery".
Many countries around the world now have their own CERT, a crucial component in the sharing of information to prevent cyber-attacks, BBC reported Monday.