Email management provider Mimecast said that hackers have compromised a digital certificate it issued and used it to target select customers who use it to encrypt data they sent and received through the companys cloud based service. In a post published on Tuesday , the company said that the certificate was used by about 10 percent of its customer base, which—according to the company—numbers about 36,100. The “sophisticated threat actor” then likely used the certificate to target “a low single...

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