Prime Minister Tony Abbott is confident there won't be further privacy breaches after the immigration department's accidental publication of the personal information of 10,000 asylum seekers.
The details of every asylum seeker in Australian detention, community detention or on Christmas Island was revealed by the breach on the department's website.
Mr Abbott told reporters in Sydney on Tuesday that a full investigation was underway.
"We'll get to the bottom of it and it won't happen again," he said.
"It shouldn't have happened. It was an error."
KPMG are investigating, and an interim report is expected next week.
The Australian Privacy Commissioner Timothy Pilgrim will also investigate.
Meanwhile, Defence Force chief David Hurley has admitted mistakes were made when Australian border protection vessels breached Indonesian sovereignty six times while trying to turn back asylum seekers.
However, he is confident the incursions won't happen again.
A Defence and Customs review released on Wednesday found Australian ships inadvertently entered Indonesian territorial waters six times between December last year and January 2014, in a series of events that has placed further strain on relations between the two countries.
General Hurley said defence had yet to determine "exactly why some decisions were made".
"But frankly, from our point of view we've acknowledged the mistake, we've got to take that on chin, get on with the job we're doing, and a job I think that's achieving results," he told ABC Radio on Thursday.
