Public key crypto key exchanges (RSA, D&H, ECC) would be ‘flat-lined’ under a quantum computer attack … "Open Problem”

Brian Snow, Former Technical Director of the US National Security Agency (NSA), Public Key Cryptography 30th Anniversary Conference, Dec 2006

"One often hears recommendations for key-sizes of public-key cryptosystems needed to obtain security for 30 years and even 50 years. Anyone wanting a real security of this magnitude should probably take the construction of the quantum computer into consideration."

ECRYPT, “D.PROVI.3 – First Summary Report on Unconditionally Secure Protocols”, January 2005

"Security and dependability issues typically go along with the life cycle of a technology.  The trend to first deploy a technology and later fix its problems – typically driven by economic motives – is gradually making way for security by design, resulting in improved security at the beginning of the life cycle."