encryption has been a source of tension between government and the tech industry. end—to—end encryption is a specific form where, unlike in previous forms of encryption, there is no actual key. so, historically, you could go to a provider of a communication service, whether it's post or high—end internet communications, you can serve a warrant and say "we need access to this." with end—to—end encryption, the company can say "there is no way of giving you that access." so privacy campaigners and many in the tech industry will say this is a very good thing, because it means that hackers, hostile foreign governments and so forth, cannot get at these types of communications. meta owns whatsapp, which already uses end—to—end encryption. it had planned to introduce similar features by default to facebook and instagram's messenger services. however, it's pushed back its encryption plans to 2023 after campaigning by child welfare groups.