Thirty years on, cryptography still too hard to use?

US government controls held back cryptography in the past, but today, it's usability that blocks adoption, a panel of experts said on Thursday. At an event in Mountain View, California, celebrating 30 years of public key cryptography, several top minds in the field gathered for a trip down memory lane. Over the years, public key cryptography has grown from an idea in a paper published by Whitfield Diffie and Martin Hellman, both present at the event, to technology used in everyday transactions on the web.