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Does Signal or other communication protocol based on E2EE use signature too?

cr flag

I'm researching about e2e encryption. Do the protocols that use e2ee to exchange information also require users to sign the message before encrypting it with the shared secret? Is it even required to ensure the authenticity of the message being sent?

kelalaka avatar
in flag
https://crypto.stackexchange.com/q/54082/18298
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