Former Cabinet minister Judith Collins faces being pulled into the high-level inquiry into intelligence information being sent to blogger Cameron Slater after new information from the hacker known as Rawshark.
The Herald now has information purporting to be social media conversations and emails between Ms Collins and the blogger Cameron Slater.
Among the information, which was said to be hacked from Slater's computer, is an apparent discussion about the political demise of former Labour leader Phil Goff.
The conversation appears to show Slater and Collins discussing Mr Goff's departure from Parliament in the context of an expected Official Information Act response just days before the unusually swift release of an intelligence briefing to the blogger from the SIS.
Ms Collins told the Herald she had "no record" of conversations supplied to the Herald. "I believe you have forged documents. You are likely to have been taken in by a criminal."
She said she had " no record of any Facebook conversations" with Slater. "Cameron has advised me that he has now gone through all his Facebook conversations and there are none with me. I am now considering lodging a complaint to Police regarding what I believe to be forgeries."
When the Herald asked why she referred to Facebook when questions didn't specify the source of the content, she said: "Because twitter is limited to 140 characters and I don't have any other social media that I use."
The Official Information Act release from the SIS, made just days after it was requested, showed SIS director Dr Warren Tucker had briefed Mr Goff on Israeli backpackers the SIS had initially suspected were spies - information the Labour politican had claimed not to have been told.
Nicky Hager's Dirty Politics book raised questions as to whether Slater was tipped off about what to ask for and when the information would be coming as part of a politically motivated attack.
The Herald is currently analysing the new information but has matched the dates of an apparent conversation between Ms Collins and Slater with the days leading up to the release of the SIS information.
In discussing Labour's prospects for the 2011 election, Ms Collins is said to have sent a message to Slater on July 31 2011 at 8.27am saying: "Can't imagine that they can find someone to take the fall for Phil. When Phil fails, will he then resign from Parliament so we can have a by-election so soon after the election? perhaps he should just go now and then we can save money on a by-election?"
Slater is shown responding: "Well hopefully I will get my reply to my OIA on monday. then we will see what happens."
Collins: "Oh dear. All this open government thingy."