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NoHumanBeing
1 year ago

This happens when transmitters and receivers have to “treat” a new key, but one of them is not online (e.g. mobile phone or no network).

WhatsApp uses end-to-end encryption (like many messengers). The keys have to be changed from time to time. For the negotiation of a new key, the Diffie-Hellman key exchange (or a variant of it working with “elliptic curves”) is probably used. This is an “interactive” protocol for which some messages must go back and forth between the two participants until they have “adjusted” a new key. If one of the participants is not reachable, then “stock” all here and you see this message.

That means: The transmitter has already sent a message and its device has “announced” that it wants to send the message, but before the two participants have “adjusted” to a common key, it cannot be transmitted.

NoHumanBeing
1 year ago
Reply to  Lisa1116

You don’t have to have the app opened because it probably happens in the background. Due to power-saving mechanisms, etc. (or poor network coverage), it may, however, take a while until the apps actually “expand” a common time when they can communicate.

Flaausch
1 year ago

Did you synchronize a PC or something? Then the messages have to be loaded.