BEDFORD, Mass. — RSA Security Inc. has agreed to buy Xcert International Inc., a private company that develops and delivers digital certificate products for securing e-business transactions, for $67.5 million in cash, plus acquisition costs.

The deal to acquire the Walnut Creek, Calif., company “is an important step toward achieving our goal of leading” the public key infrastructure marketplace “and maintaining a faster growth rate for PKI revenues and market share than any other vendor,” RSA president and chief executive officer Art Coviello said in a news release.

He added, “Through this acquisition, we are adding more than 50 Internet-centric customers, including Aetna, American Management Systems, Marconi, PNC Bank, and Wachovia.”

RSA Security is the nation’s leading encryption company. It products include RSA SecurID, an online authentication tool; RSA BSAFE encryption; and the RSA Keon digital certificate management systems.

Xcert’s Sentry certificate issuance and management product is to join the RSA Keon family of PKI products. RSA Security also said it plans this year to deliver an integrated certificate authority product combining the best features of the Sentry product and the RSA Keon Certificate Server.

The deal was announced Thursday and is scheduled to close this month.

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