EMC buying California computer security firm

EMC Corp. of Hopkinton is buying computer security firm Silver Tail Systems of Menlo Park, Calif. Financial terms of the transaction were not released.

Silver Tail, a privately-held firm, will become part of RSA, EMC’s data security business.

Silver Tail collects vast amounts of data passing through corporate networks, analyzing it to detect patterns that might indicate the presence of network intruders, or the use of illicit software that could steal or damage a company’s vital data.

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