Encryption And Decryption At The Application Layer

Hello everyone,
i would like to encrypt & decrypt data at the application level.
This data needs to be send to another device via wireless.I found one such cipher named ceaser cipher in the internet.But it looks weak and easy to be broken. Can someone suggest me robust cipher's concepts which can be done at application layer?


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I am rookie when it comes to security protocols and I am learning this as part of my job responsibilities.

Recently our Application started implementing TLSv1.2 and here are some questions that I have from my observations.

1st the term ciphers, keys, certs are all very confusing to however I started to get some understanding of these as I am reading a lot of stuff.
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