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Private and secret keys consists of secret information used as input to various kinds of cryptographic algorithms such as encryption, signature and MAC to select the concrete transformation done by the algorithm.

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WhatsApp end-to-end encryption

The client has shared keys with the phone (you scanned them as QR code) and the phone uses this to encrypt the already (on the phone) decrypted messages. +----------------------------------+ … | | | +-----------------------------------+ | | | encryption secret keys
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