Today, BitPay is excited to announce our proposal for a new passwordless authentication protocol, based on the same cryptography used in the Bitcoin protocol. By eliminating server-side storage of passwords, we can drastically reduce the impact of a compromised server.
more here.........http://blog.bitpay.com/2014/07/01/bitauth-for-decentralized-authentication.html
more here.........http://blog.bitpay.com/2014/07/01/bitauth-for-decentralized-authentication.html