Whitfield Diffie, EPIC Advisor, is best known for his discovery of the concept public key cryptography, which he developed along with Stanford University Electrical Engineering Professor Martin Hellman. Public key cryptography, which revolutionized not only cryptography but also the cryptographic community, now underlies the security of internet commerce. Earlier this year, Diffie spoke at the RSA Conference centered on IT security. Diffie shares his thoughts on Bitcoin and how he devised public key cryptography.