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Cylink Corp. was accused by the Securities and Exchange Commission of overstating the company’s revenue by “millions of dollars” in 1997 and 1998, the SEC said. Trading in the company’s stock was halted on the Nasdaq Stock Market after shares fell $2.09 to $8.84. Without admitting or denying the SEC’s administrative charges, the Santa Clara, Calif.-based maker of security software for electronic mail and the Internet agreed to face stiffer penalties if the company overstates revenue in the future. No monetary penalties were imposed.