The content is encrypted using AES Algorithm with 128 bit key in CBC mode. AES is a symetric key algorithm and hence uses the same key for both encryption and decryption. On the client side, to decrypt the content you will need the KEY and Initialization Vector
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Can you please post more details on the requirement. I have a good hands on ADA(Analysis and Design of Algorithm). I would like to know more details on same if we have to bid appropriately on the project.