Adobe breach notification taking longer than expected

Adobe said it is taking longer than anticipated to warn customers about a massive data breach that compromised data on tens of millions of people, leaving some in the dark 10 weeks after the attack was discovered.

That puts those who have yet to be alerted at increased risk of cyber-scams and identity theft, as part of the massive trove of data stolen from Adobe is circulating on the internet.

Adobe identified the attack on September 17 and began notifying customers "immediately" after it disclosed the breach on October 3, according to company spokeswoman Heather Edell.

"Email notifications are taking longer than we anticipated," she said.

The company has had to validate email addresses of those affected, and also limit the number of notifications sent at any one time to make sure they don't get blocked by email providers or tagged as spam, she said.

Edell said the company has notified by email and letter some 2.9 million Adobe customers with credit or debit card information taken by the attackers.

It is in the process of notifying tens of millions of others who have Adobe ID accounts for using its customer website, she said. She declined to provide a specific number on how many had been affected, saying the investigation was still ongoing.

A file containing information on some 152 million Adobe ID accounts has circulated on the internet for at least three weeks. It includes email addresses along with encrypted passwords and password hints, according to multiple security firms that have reviewed its contents.

Edell said it was not accurate to say 152 million customer accounts had been compromised because the database attacked was a backup system about to be decommissioned.

She said the records included some 25 million records containing invalid email addresses, and 18 million with invalid passwords. "A large percentage" of the accounts were fictitious, having been set up for one-time use so that their creators could get free software or other perks, she added.

Still, security experts successfully identified an unknown number of passwords in that file by analysing password hints and using other techniques to guess at them.

Other companies, including Facebook, have identified users who employed the same passwords as those contained in the widely circulated file on Adobe customers.

The social network then required affected users to verify their identity and reset their passwords.

"We actively look for situations where the accounts of people who use Facebook could be at risk, even if the threat is external to our service," said Facebook spokesman Jay Nancarrow. "When we find these situations, we present messages to people to help them secure their accounts."