The Accident Compensation Corporation's privacy measures are not up to scratch, ACC Minister Judith Collins has told an employers group.

The corporation, which is the subject of three independent inquiries after a major privacy breach, needs to recapture the trust and confidence of the public, Ms Collins told a health and safety conference of the Northern Employers and Manufacturers' Association.

"Privacy and information security is the biggest issue facing ACC at present," she said.

Her comments come after an ACC staffer mistakenly sent details of more than 6000 claimants to Brownyn Pullar - the biggest privacy breach in New Zealand's history.

The Privacy Commissioner, police and Auditor-General are all looking into the blunder.

Ms Collins told the conference she was yet to be convinced the department's protection of private information was adequate.

"I'm not yet satisfied ACC's privacy provisions and protocols are appropriate, or are being complied with to the level they should be."

She said ACC would implement any recommendations that came out of the reviews but before then she wanted processes strengthened.

"This work must be a high priority for ACC," she said.

The corporation's financial performance had improved in recent years but Ms Collins said its focus now needed to be on improving service and strengthening public trust and confidence in the scheme.

Ms Collins is pursuing legal action against two Labour MPs and Radio New Zealand over claims that she leaked a confidential email to the media.