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Chaum’s idea was to break the linkage between the issuance and usage of a credential. This means that when Alice shows her credential to the website, all the site learns is that Alice has been given a valid credential. The site should not learn which issuance flow produced her the credential, which means it should not learn her exact ID; and this should hold even if the website colludes with (or literally is) the issuer of the credentials. The result is that, to the website, at least, Alice’s browsing can be unlinked from her identity. Imn other words, she can “hide” within the anonymity set of all users who obtained credentials.，这一点在体育直播中也有详细论述
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There’s still a sturdy aluminum case, with no cheap plastic to be seen. It includes a 13-inch Retina display, a 1080p webcam, two USB-C ports, a headphone jack and optional Touch ID. You’ll need to use one of those ports for charging, as there’s no MagSafe connector on this MacBook. The side-firing speakers support Dolby Atmos playback. And the MacBook Neo comes in four colors than usual: silver, indigo, blush and citrus. The keyboard is color-matched to the case, too.，更多细节参见快连下载-Letsvpn下载