Observers have criticised this year's Black Hat and Def Con Internet security conference for failing to paint a picture of an organised, mature hacker underground - in spite of the increased number of security experts and government officials attending the event.

Black Hat points to slack hackers

Despite infecting tens of thousands of computers worldwide, the W32.Blaster worm is poorly written and inefficient, according to security experts. However, they warned that future versions of the worm could cause far greater harm.

Worse Windows worms to come, warn experts

A future generation of computer worm could spread across the internet in a matter of seconds, a security expert has warned.

Users beware superworm of the future