WhatsApp now supports messages with third-parties

Martin Shelton

Principal Researcher

Electronic Frontier Foundation. (CC BY 2.0)

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In the news

Under the new European Union law, the Digital Markets Act, Meta is required to allow interoperability between third-party chat software and its WhatsApp and Facebook Messenger apps. These tools offer end-to-end encryption using the Signal protocol, the strong encryption specifications pioneered by the Signal encrypted messaging app. According to Meta, this will be an opt-in feature to help mitigate against receipt of spam and scams from third-party integrations.

In its announcement, the company promoted the security benefits of the Signal protocol, preferring third parties use this protocol, but allowing other protocols besides Signal if they demonstrate they offer the same security guarantees. “To interoperate, third-party providers will sign an agreement with Messenger and/or WhatsApp and we’ll work together to enable interoperability,” Meta added. It is currently unclear if Signal will sign such an agreement. Read more here.

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What you can do

  • In my experience, WhatsApp — with a user base of over 2 billion — suffers from a much bigger problem with spam and scams than Signal. And because it's unlikely third-party developers besides Signal can offer equivalent or better security guarantees (at least for now), we think this primarily makes a difference for users of Signal who may want to talk to people on WhatsApp. This might be handy if, say, you have a source or colleague who doesn't want to use Signal and spends a lot of time on WhatsApp.
  • While WhatsApp does use the Signal protocol, there are a lot of ways to inadvertently leak data from WhatsApp beyond the app. For example, WhatsApp has a fun habit of encouraging you to back up your conversations to Meta in a format legible to the company. Likewise, you might be inadvertently leaking photos received through WhatsApp outside of the app. This potentially affects anyone you talk to on third-party apps as well. So if you are a WhatsApp user and want to maximize protections, read our guide to upgrading WhatsApp security.
  • Compared to WhatsApp, Signal users by default can be more certain that they are not leaking data beyond the app. But you can still tighten its settings even further. Read our guide to locking down Signal.

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Our team is always ready to assist journalists with digital security concerns. Reach out here, and stay safe and secure out there.

Best,

Martin

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