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Authentication is successfully validating that an entity you are communicating with is actually who they claim to be. The entity typically demonstrates who they are by showing they possess a secret that only they could know.

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Encrypting a TCP connection between two unknown nodes

What you are looking for is how to implement an SSL/TLS layer on top of your TCP connection. Try to use the OpenSSL library, it's the most popular implementation.
Theofilos Papapanagiotou's user avatar