Conference delegates leave themselves wide open to attack. More than half of the computers used by security experts attending the RSA Conference on security lack the proper protection and may have been compromised, according to wireless security firm AirDefense.

The company scanned all wireless traffic on the first day of the conference and found a total of 623 Wi-Fi enabled notebooks and mobile phones.

Some 56% of these devices were configured automatically to log-on to networks with common names such as 'Linksys' or 'T-Mobile', a feature known as an open access wireless account.