What is that AES encryption you see in programs that encrypt files? Its a symmetrical encryption algorithm (There is a single password used). It was developed in 1998 to win a contest on which would be the best encryption software. It won the contest based on speed and difficulty to break. The 256 bit encryption is the strongest and your chances of breaking it is 1 in 2^256 or 1 in 115,792,089,237,316,195,423,570,985,008,687,907,853,269,984,665,640,564,039,457,584,007,913,129,639,936.
So when you check mark this encryption you know that it will not be broken in your lifetime.
