Your brain could be your next password. Researchers at Binghampton University and The Basque Center on Cognition, Brain and Language have conducted a study which accurately identified subjects' brains through their reactions to words and phrases.

The study, appropriately named Brainprint, involved 45 participants with three electrodes each. They were then read a series of acronyms. Scientists focused on observing the part of the brain associated with semantic meaning. Because each person has a different association or reaction to the same word or letter, patterns emerged which distinguished different people through their brain signals. 

After six months of testing, the method maintained a 90% accuracy rate. 

Your brainprint could potentially serve as a marker of your identity in the future, much like a fingerprint or retina scan.