How to use Encryption/Decryption to send encrypt data using post (JSON) method?

how to send the password,bank account, credit card information using JSON POST method,We cant send it as plain text. How to use encryption/Decryption method for sending this highly important data?

Three major problem :

1. How to encrypt data ? (Data means password,bank account, credit card information).


2. How to send this encrypt data using web service (JSON format)?


3. How to retrieved this data from server and decrypt ?

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