All non-Australian citizens travelling to Australia require a visa. Note that citizens from a number of eligible countries can apply online for an eVisitor visa or an Electronic Travel Authority (ETA). See the Department of Home Affairs website for a visa list and details on visitor visa options.
If you have a valid New Zealand passport, you can travel to Australia and you will be issued with a Special Category Visa on arrival.
Should you require a confirmation of attendance to obtain your visa, please send an email to email@example.com, including your full name, university, country, and a copy of your abstract in the form described here.