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Why does AES-GCM means No MAC key, instead of MAC key what they are going to use?

The AEADs are internally computing a hash value over the encrypted data. That hash is sent together with the encrypted data. Adding a second hash as MAC together with a MAC key would not provide more ...
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Why does AES-GCM means No MAC key, instead of MAC key what they are going to use?

TLS records need to be protected both for confidentiality (defence against an attacker learning their content) and for authenticity (defence against an attacker modifying them in transit). So they are ...
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