"As to how people have voted, we go to huge lengths to protect that information.
"There are demands from various sectors for electronic voting but at present our process is overwhelmingly manual so in terms of cyber-risks the voting process is low risk," said Mr Peden.
Electoral Commission chair Sir Hugh Williams said the Commission would have to be certain of security before it moved to electronic voting.
"It is interesting that internationally nobody seems able to put in place a system of electronic voting that still guarantees the secrecy of the ballot and freedom of the voter from coercion."
However, Mr Peden said, it was the intention to eventually introduce some form of electronic voting. He did expect that by 2014 overseas voters would be able to upload their ballot papers to a secure website. Currently, voting papers were mailed or faxed through by those who could not get to a New Zealand diplomatic post.
Mr Peden said the number of overseas voters had shrunk from about 30,000 to 22,000 and the Commission wanted to lift that to 30,000 again.
One of the problems was that fax machines were not as readily available as in the past.