Technology, media and telecommunications businesses are not doing enough to protect themselves against cyber threats, according to a report from Deloitte.

Only seven per cent of companies believe they are prepared for future threats.

Many are ignoring the threat from the inside, said Deloitte technology security partner James Alexander.

"Something that many organisations overlook is the source of the threat," he said.

"The most dangerous threats come from within, with 75 per cent of companies citing human error as one of the root causes for security failures – putting it ahead of operations and technology."

The survey also suggests that recent disclosures of public data loss are only the tip of the iceberg. Only 53 per cent of companies publicly disclosed the loss of customer data, and many only do so in situations where it is required by law.