Global accountancy firm Deloitte -- known as one of the "big four" -- has been hit by a sophisticated hack. With echoes of the Equifax data breach and CCleaner hack, the cyberattack went undetected for months and results in confidential emails being accessed, as well as company plans, and the private information of high-profile, blue-chip clients. Deloitte says that only a small number of its clients have been affected, but the size and importance of those that it deals with -- including US government departments -- means that even a limited number could have great impact. The firm is said…
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