The bad blood between Cisco Systems Inc. and organizers of the Black Hat conference appears to be a thing of the past. One year after suing the hacker conference for allowing security researcher Michael Lynn to disclose a security vulnerability, Cisco is returning to Black Hat -- this time as one of the show's top sponsors. Black Hat USA will be July 29 to Aug. 3 in Las Vegas.

"Despite what happened last year we wanted to show our commitment and show our openness to working with the security research community," said John Noh, a Cisco spokesman. Cisco has sponsored Black Hat in the past, but this is the first time it has shelled out for the show's most expensive "platinum" sponsor status, Noh said.

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