WhatsApp Quietly Extends Encryption to iCloud Backups of Chat Logs

WhatsApp has bolstered the security of the iCloud backup feature in its messaging platform, in an attempt to protect archived chat logs from being accessed in a readable form (via TechCrunch).

WhatsApp has offered end-to-end encryption on its messaging service for some time, but that encryption did not previously extend to iCloud backups of messages. Given that Apple holds the encryption keys for iCloud, a subpoena of Apple or an unauthorized iCloud hack could potentially allow access to WhatsApp messages backed up there.

However, WhatsApp has moved to prevent that possibility by also pre-encrypting the backup files. "When a user backs up their chats through WhatsApp to iCloud, the backup files are sent encrypted," a WhatsApp spokesperson told Forbes, confirming the change.

WhatsApp quietly added the encryption to WhatsApp iCloud backups late last year, however the change only came to light last week when professional hackers claimed to be able to circumvent the security measure.

According to Russian-based Oxygen Forensics, third-party hacking tools are able to download the encrypted WhatsApp data backed up to iCloud and then generate an encryption key to decrypt the data using the associated SIM card. The tools could potentially be used by police with access to a phone where the WhatsApp account has been deactivated but the encrypted messages are still stored in iCloud. WhatsApp has yet to comment on the claims.

The encryption debate has been reignited in recent weeks on both sides of the Atlantic. FBI director James Comey revealed earlier this month that his agency had been unable to access the data on more than 3,000 mobile devices in the first half of the fiscal year, despite having legal authority to avail themselves of the contents.

A recent statement by U.S. senator Dianne Feinstein also appeared to confirm that the government had used $900,000 of public money to pay for the third-party tools to unlock the iPhone used by the San Bernardino terrorist. No information of relevance was found on the device, the FBI later revealed.

Meanwhile in the U.K., government home secretary Amber Rudd recently claimed that it is "completely unacceptable" that authorities cannot gain access to messages stored on mobile applications protected by end-to-end encryption, such as WhatsApp. Rudd said she would be discussing the situation with technology companies in the near future.

Since that time, a draft technical paper prepared by the U.K. government has been leaked that contains proposals related to the removal of encryption from private communications. The paper reveals that companies would be required to provide the raw data "in an intelligible form" without "electronic protection" within one working day. Discussions about the feasibility of the proposals are said to be ongoing.

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