Nowadays, more and more of the activities once associated with that good old physical world will be performed at our keyboards, phone devices and palmtops and over digital televisions. Crypto lies at the center of this transition, and were going to ask a lot of it over the next few years. Will our e-mail and phone systems ever have strong encryption and digital signatures built in? Will feats of crypto really send digital cash to replace the paper money, and enable us to spend it in stores?

　　The issues in the crypto-battle, the first great war of the digital age, were more straightforward. As people cozied up to digital communications, and e-commerce became a force in the economy, the need for cryptos near-magical power of encryption and authentication became red hot. But those at the helm of the government focused not on the benefits, but the dangers the fear that terrorists or drug dealers would use this digital shield. Ultimately, the question boiled down to this: in an attempt to deny those dangerous few, were we all to be deprived of the tools of privacy?

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