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Encryption is used for maintaining the integrity of the data. So whenever data is sent through https medium data will be encrypted and only at the genuine receiver decryption will happen to convert data into original form. Encryption and decryption will be done at presentation layer of osi. All the data sent through https medium will be encrypted.
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Whenever anyone request in https ,ssl/tls comes into picture where client send reply and server sends with public key and digital certificates and client verified and sends his public key where it is encrypted with public key of server with agreed algorithm (encryption) and server at other end decrypts with his private key (decryption) where clientkey exhange took place

Presentation layer is responsible for encryption and decryption
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I'm going with the assymmetric encryption scenario where encryption and decryption will work.

● if A sends the info encrypted with public key to B, B decrypts the info with matching private key.

●if C sends the info encrypted with private key to D, D decrypts the info with matching public key.

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