Trusted Information Systems Inc., a maker of firewalls and other data security products, said it agreed to acquire Haystack Laboratories Inc. of Austin, Tex.

Haystack is best known for its Stalker and WebStalker software, which detect and block out unauthorized activity or misuse of a computer or Web site.

Intrusion detection is in growing demand as businesses evolve in on-line directions. Haystack founder and chairman Steve Smaha said Trusted Information Systems "reaches a similar but larger customer base than we do" and can boost sales while providing a broader range of products.

TIS, which sells the Gauntlet firewall and the RecoverKey data encryption system, said it will exchange an undisclosed number of shares for privately held Haystack.

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