Encrypt text and send in Bluetooth ,then decrypt at the receiver end

Can someone please suggest an extension to encrypt and decrypt text.
I have two apps a Server and a Client in which we can send messages to each other through bluetooth. I want to implement encryption where in an encrypted text will be sent from one end and it will be decrypted at the other end.

maybe this one can help.

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I tried using it but was not helpful.Any other extension?

Here other extension to encrypt, decrypt.

Will try and this. Thank you.