Suppose I want to encrypt and decrypt my data between

Question

Suppose I want to encrypt and decrypt my data between

the server and the client in an app like mobile app. Which one is better?
1- Only the server has a private key and public key. The server sends its public key to the client. Client encrypts their data + secret key using the public key and sends them to the server.
Finally the server and client connect to each other using the secret key(symmetric key).
2- Both client and server have their own private and public key. (asymmetric key)
Both of them are secure, right? but the second one is slower?

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23.07.2019

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CodeSteele · Accepted Answer

CodeSteele

I mean #1 is basically how HTTPS work, use asymmetrical crypto to negoitate a faster symmetrical key. The trick is making sure you're not being MITM'd during this though.

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23.07.2019

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Suppose I want to encrypt and decrypt my data between

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