Apparently, not only is it possible, but it has been successfully demonstrated by a researchers in Spain.
However, this could be apromising beginning.
However, the current process requires electrodes to work.
source: www.techworm.net
Forget fingerprint and Iris scan, Your next password could be your “brainprint”
Researchers working on ultimate password with "brainprint," unique unique patterns of brain activity could be your next password
