Cryptography is the art of transforming information into a form that is unintelligible to anyone who does not possess the key to unlock it.
If you only read the books that everyone else is reading, you can only think what everyone else is thinking.
The greatest fear is not of death but of life.
The best way to find out if you can trust somebody is to trust them.
And I hope you will come back here to Harvard 30 years from now and reflect on what you have done with your talent and your energy. I hope you will judge yourselves not on your professional accomplishments alone, but also on how well you have addressed the world's deepest inequities…on how well you treated people a world away who have nothing in common with you but their humanity.