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This is an era of wireless (mobile) communication and computing where mobile devices such as personal digital assistants, smartphones, etc., are being used in place of traditional computers. To secure wireless communication many services and protocols have been developed such as IPSec, SSL/TLS, etc. Heavy computations such as generating RSA keys (large prime numbers) are difficult to generate on mobile devices because the mobile device possesses limited resources. But it can be simplified with the help of smartcards. The paper describes how the smartcards are used to provide content encryption for mobile devices to secure the communication. The well-known Rijndael cryptographic algorithm is used in this concept to secure the communication between the mobile devices or mobile device with any conventional server.