AES Encrypt Decrypt

Taking forward the @Nitin sir's Description 

 

it is the Key which will be same at Both the IOS and Server 

 

and the IV which is generated dynamically will be sent in each call 

 

that IV will be passed to the Decrypt method along with the Key which is same at Both the ends 

 

We  have implemented this successfully 

See if following is of any help:

 

http://stackoverflow.com/questions/273452/using-aes-encryption-in-c-sharp

 

However, the most important part is the decryption key. The key has two parts [the key and the initialization vector (IV)], and I think you will need to have to both so as to decrypt it.