Ruby on Rails

hello, everybody.

in ror, we can add a after_filter to a controller.

 def aes_encrypt

    response.body = AesHelper.aes_encrypt(response.body)

  end

 after_filter :aes_encrypt   

and all action's repsonse int the controller can be encrypt.

and my question is , how to decrypt data use before_filter, or anything else.

ex: i want to post json data to /usr/register,   the json data is {"name":"good", "password":"nice"}. encrypt it to 

5B2YC7WzgFmaivnATP1ZLR4sTXB3SsWEUeMpUbcYiylcvHxfSStYIBqwIMCjZAY3

so i post 5B2YC7WzgFmaivnATP1ZLR4sTXB3SsWEUeMpUbcYiylcvHxfSStYIBqwIMCjZAY3  to /usr/register

in action register , i would write code like this:

#### already decrypt.

def register

   User.register(params[:name], params[:passport])

end

so, how can i decrypt 5B2YC7WzgFmaivnATP1ZLR4sTXB3SsWEUeMpUbcYiylcvHxfSStYIBqwIMCjZAY3 before action register to use params directly in register

thanks for anybody's help!!

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