The All Blacks, showing signs of paranoia, have beefed up security at their training sessions in Durban, a couple of days ahead of their Tri-Nations crunch Test against South Africa.

Not only did the All Blacks only reveal their training venue less than an hour before it began, but they also only allowed New Zealand media to attend.

The team had several security personnel patrolling the perimeter of the school grounds where they trained and one of them screened the area with his binoculars.

Speculation is rife in the New Zealand media that the Springboks knew the All Black line-out calls prior to the Boks' 28-19 win in Bloemfontein last week.

Matfield orchestrated an effective assault on the All Blacks' line-out last week and said it was in fact a "compliment" that the Kiwis would go to such extreme measures.

However, Matfield dismissed the spy claims and said he knows the All Blacks line-out exceedingly well - just from studying videos of New Zealand's previous Test matches this year.

The lanky Bok lock, generally regarded as the line-out master of world rugby, says he does not care who watches him preparing for a game, because they will still have no idea what he is going to call come game time.

"I think it is easy [to read the All Black line-outs], because we have seen three of their test matches, so of course we have got the line-outs. I don't know why they say we have to go to a training session if we can just watch their previous three games."

There were suggestions the Springboks knew the All Blacks line-out calls before last weekend's Test in Bloemfontein, but Matfield dismissed the claim.

He put his success down to "diligent homework" and said his opponents were being too cautious.

"That's what I say, I do a lot of work on the previous games they have played. I know as a rule we have got every training session open ? so guys can watch every line-out session of ours if they want to."

Matfield also noted that if an opposition team spied on the Boks training session, they still do not know which strategies they will use.

"They don't know when I am going to call what in the game, that's what you need to get right ? to make the right calls on the field."

All Black captain Richie McCaw appeared less paranoid than the management members of the squad.

"I really wouldn't have a clue; Matfield is very good at what he does and whether he knew before or after I have no idea."

McCaw admitted that they, the Kiwis, should shoulder the blame for the line-out woes.

"We allowed him [Matfield] to be good by playing into his hands a little bit," McCaw said.

"He got the first one and then we were reluctant to go back to what we were doing.

"It's the old story, you lose a couple and everyone gets a bit twitchy."