AES is a small, fast, hard to crack encryption standard and is suitable for a wide range of devices or applications. It has been determined as the best compromise between a combination of security, performance, efficiency, ease of implementation and flexibility.
128 bit AES offers a total of 3.4 x 10^38 individual keys. It is estimated that if a DES key generator were able to discover 1 DES key per second, it would take 149 thousand-billion (149 trillion) years to crack a single 128 bit AES key.
Currently, the technology is not available to do this, As a note, the universe is accepted as being only approximately 20 billion years old !
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