Encrypting/Decryption

Hello,

As i am new to postgresql and django. please help me to acheive the
following.

I have created a database with some tables and i want to encrypt the
data in database tables, so please someone guide me how to do it.?

i want to encrypt the data and also decrypt through django, so tell me
which is right way either to use pgcrypto or pycryto,
i am not understanding neither of them. please help.

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Regards :
Venktesh Guttedar.