One way to aid data deletion is encryption, said Jacob Hoffman-Andrews, senior staff technologist at the Electronic Frontier Foundation. If a user’s data is encrypted with a single key, destroying the key associated with an account is easier than finding and wiping each place the customer's data exists. That way, the information remains encrypted, but the key to decrypt the information is gone. The key will similarly need to be deleted and overwritten for it to be erased.
The Ashley Madison breach is "also a good case of, ‘Don't retain more data than you need,' " Hoffman-Andrews wrote in an e-mail. He recommends that all companies that store personal data audit their systems often to make sure everything they think they are deleting is actually being erased.
When it comes to data deletion, Ashley Madison may not be as bad as many other so-called dating sites, according to the EFF. In its 2012 ranking of dating sites based on their security and privacy practices, Ashley Madison was among the 3 out of 8 sites ranked that earned high marks for data deletion practices.