HOPKINTON, Mass. - Information management giant EMC Corp. isbuying RSA Security Inc. for about $2.1 billion. "Businesses can'tsecure what they don't manage, and when it comes to securinginformation, that means simply two things-managing the data andmanaging access to the data," says Joe Tucci, chairman, presidentand CEO of EMC in Hopkinton, Mass. "Bringing RSA into the foldprovides EMC with industry-leading identity and access managementtechnologies and best-in-class encryption and key managementsoftware to help EMC securely deliver information lifecyclemanagement," Tucci says. Bedford, Mass.-based RSA Security wasknown for its SecurID multifactor authentication tokens and itsBSafe line of encryption and privacy products and had recentlybought two firms well known in credit union land: PassMarkSecurity, the California-based pioneer in multi-factor onlinebanking sign-ons, and Cyota Inc., the New York-based provider ofISP authentication and financial services anti-fraud networks. Thepurchase is expected to close later this year.