Encryption and decryption

Question

Dear All,

 

         I am working with WCF rest Services that are created for mobile app in anroid, I want that when app team send me the password in encrypted mode then how i decrypted  it in wcf method , Is there any common way to encrypted password using anroid and then i decrypted it in wcf service method.

Please provide me a way to achieve this,

 

 

Thanks,