The Kansas-based company is to operate as part of RSA, the security division of EMC, after the deal closes, which is expected to take place in the first quarter of 2010.
EMC did not disclose the financial details of the deal, but said the transaction is not expected to have a material impact on its revenue or earnings for the 2010 fiscal year.
Archer, which claims six million users including 25% of the Fortune 100, is to remain at its headquarters in Overland Park after the acquisition is finalised.
"Traditional security management focuses primarily on addressing technology issues, but our customers are telling us that their real challenges are in areas of policy management, audit and compliance," said Art Coviello, president of RSA.
With Archer, RSA will be able to make information security a more integrated element of overall IT-GRC efforts, he said.