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I have writ­ten this book par­tly to cor­rect a mistake.

Seven years ago I wrote ano­ther book: Applied Cryp­to­gra­phy. In it I descri­bed a mathe­ma­ti­cal uto­pia: algo­ri­thms that would keep your deepest secrets safe for mil­len­nia, pro­to­cols that could per­form the most fan­ta­sti­cal elec­tro­nic interactions-unregulated gam­bling, unde­tec­ta­ble authen­ti­ca­tion, ano­ny­mous cash-safely and secu­rely. In my vision cryp­to­gra­phy was the great tech­no­lo­gi­cal equ­ali­zer; any­one with a cheap (and get­ting che­aper every year) com­pu­ter could have the same secu­rity as the lar­gest govern­ment. In the second edi­tion of the same book, writ­ten two years later, I went so far as to write: „It is insuf­fi­cient to pro­tect our­se­lves with laws; we need to pro­tect our­se­lves with mathematics.”

It’s just not true. Cryp­to­gra­phy can’t do any of that.
— Bruce Schne­ier, „Secrets and Lies

„PKI is a solu­tion looking for a pro­blem.
— Peter Gut­t­mann