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So say a dozen security specialists and former law-enforcement officials, who described an intensifying and largely unspoken sense of unease inside many companies after the recent breach of Sony Corp.’s networks.

At least one former employee of Sony Corp. may have helped hackers orchestrate the cyber-attack on the company’s film and TV unit, according to security researcher Norse Corp.

The FBI refused to budge on Tuesday off its finding that North Korea masterminded the massive Sony studio hack — despite a growing number of private cyber-security firms concluding there was no evidence of such a finding.

The studio has canceled the release of the Seth Rogen-James Franco comedy, which was set to open Christmas Day.

Trend Micro Vice President JD Sherry and Invincea CEO Anup Ghosh discuss how to respond to the Sony hacking.